2BUN4-ACD3631Wireless Earphones

ACD3631 Wireless Earphones User Manual Product structure diagram 1.Breathing Light 2.Speaker Sound Outlet 3.Charging Contact 4.Charging Case Display Screen 4 1 3 Tips: Gently place the earphones into the external ear canal and adjust the earphones after insertion Adjust the wearing angle to a comfortable angle. 英语English 2 Preface Thank you for purchasing an AOC product. For best results, please read this manual carefully before use. Switch on/off Power On: Open the charging case and take out the earbuds. They will power on automatically and wait for device connection. Power Off: Place both earbuds back into the charging case and close the lid. They will power off and start charging automatically. Connection Operation W ireless Connection: Open the W ireless Settings page of Settings to search and operate. Answer/hang up Answer/Hang up a call: Single tap the left or right earbud. Reject a call: Press and hold the left or right earbud for 2 seconds. Play/Pause Play/Pause music: Single tap the left or right earbud. Switch tracks: Previous track: Double-tap the left earbud. Next track: Double-tap the right earbud. Volume control Volume down: Triple-tap the left earbud. Volume up: Triple-tap the right earbud. Special mode Voice Assistant (e.g., Siri): Press and hold the left or right earbud for 2 seconds, releas e when you hear a "beep" sound. 英语English Preface Thank you for purchasing an AOC product. For best results, please read this manual carefully before use. Wireless headphone parameters Operating Frequency Band : 20Hz-10KHz Maximum Radio-Frequency Power : 2.14 dBm Safety Instructions 1. Before first use, pleas e fully charge the product. 2. This product is not a toy. Children under 12 years old must use it under adult supervision. 3. Pleas e use 5V/1A chargers with official safety certification from regular manufacturers. Do not use high-voltage fast chargers to avoid product damage. 4. Charge in a safe environment. Unplug the charging cable promptly after the charging case is fully charged to prevent battery damage from overcharging. The charging case adopts a Type-C charging port. 5. This product contains a lithium battery. If left unused for a long time, charge it at least once a month. 6. W hen using the product via Bluetooth, adjust the headphone volume to an appropriate level to prevent permanent hearing damage caused by long-term high- volume use. 7. This product contains magnetic materials. Keep it away from devices with strong magnetic or electric fields such as microwave ovens and refrigerators during use and storage. 8. Before cleaning and maintenance, stop using the product, close all applications, and disconnect all connections and cables from other devic es. 9. Dispose of waste electronic products in accordance with local regulations. Do not discard electronic equipment, components or batteries with domestic garbage. 英语English Vorwort Vielen Dank, dass Sie sich für ein Produkt von AOC entschieden haben. Um eine optimale Leistung zu gewährleisten, lesen Sie bitte diese Anleitung vor der Verwendung sorgfältig durch. Ein-und Ausschalten Einschalten: Öffnen Sie das Ladecase und entnehmen Sie die Kopfhörer. Sie schalten sich automatisch ein und warten auf die Verbindung mit dem Gerät. Ausschalten: Legen Sie beide Kopfhörer zurück in das Ladecase und schließen Sie den Deckel. Sie schalten sich automatisch aus und beginnen mit dem Laden. Verbindung über WLAN herstellen Öffnen Sie die W LAN-Einstellungen in den Einstellungen, um nach Netzwerken zu suchen und diese zu bedienen. Anruf annehmen/ablehnen Annehmen/Auflegen eines Anrufs: Tippen Sie einmal auf den linken oder rechten Kopfhörer. Anruf ablehnen: Halten Sie den linken oder rechten Kopfhörer 2 Sekunden lang gedrückt. Wiedergabe/Pause im Musikmodus Musik abspielen/pausieren: Tippen Sie einmal auf den linken oder rechten Kopfhörer. Titel wechseln: Vorheriger Titel: Doppeltippen Sie auf den linken Kopfhörer. Nächster Titel: Doppeltippen Sie auf den rechten Kopfhörer. Lautstärkeregelung im Musikmodus Lautstärke verringern: Tippen Sie dreimal auf den linken Kopfhörer. Lautstärke erhöhen: Tippen Sie dreimal auf den rechten Kopfhörer. Sondermodi Sprachassistent (z. B. Siri): Halten Sie den linken oder rechten Kopfhörer 2 Sekunden lang gedrückt und lassen Sie los, wenn Sie einen "Piep"-Ton hören. 德语Deutsch Vorwort Vielen Dank, dass Sie sich für ein Produkt von AOC entschieden haben. Um eine optimale Leistung zu gewährleisten, lesen Sie bitte diese Anleitung vor der Verwendung sorgfältig durch. Parameter des Wireless-Kopfhörers Betriebsfrequenzband: 20Hz-10KHz Maximale Hochfrequenzleistung: 2.14 dBm Sicherheitsanweisungen 德语Deutsch 1. Bitte laden Sie das Produkt vor der ersten Verwendung vollständig auf. 2. Dieses Produkt ist kein Spielzeug. Kinder unter 12 Jahren dürfen es nur unter Aufsicht eines Erwachsenen verwenden. 3. Verwenden Sie nur 5V/1A-Ladegeräte mit Sicherheitszertifizierung regulärer Hersteller. Vermeiden Sie Hochspannungs-Schnellladegeräte, um Schäden am Produkt zu verhindern. 4. Laden Sie das Gerät in einer sicheren Umgebung. Ziehen Sie das Ladekabel sofort heraus, wenn die Ladebox vollständig geladen ist, um eine Beschädigung des Akkus durch Dauerladen zu vermeiden. Die Ladebox ist mit einem Type-C -Anschluss ausgestattet. 5. Dieses Produkt enthält einen Lithium-Akku. Bei längerer Nichtverwendung laden Sie es mindestens einmal monatlich auf. 6. Stellen Sie bei Bluetooth-Verbindung eine angemessene Lautstärke ein, um Hörschäden durch dauerhaft hohe Lautstärke zu vermeiden. 7. Dieses Produkt enthält magnetische Materialien. Halten Sie es während Nutzung und Aufbewahrung von Geräten mit starkem Magnet- oder Elektrof eld wie Mikrowellen und Kühlschränken fern. 8. Vor Reinigung und W artung beenden Sie die Nutzung, schließen Sie alle Anwendungen und trennen Sie alle Verbindungen und Kabel zu anderen Geräten. 9. Entsorgen Sie Altgeräte gemäß örtlichen Gesetzen. W erfen Sie Elektrogeräte, Bauteile und Batterien nicht in d…

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Shenzhen HTT Technology Co., Ltd. Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 1 of 8 Product Name: Wireless Earphones Model No.: ACD3631 EUT Constructional Details External Photo Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 2 of 8 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 3 of 8 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 4 of 8 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 5 of 8 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 6 of 8 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 7 of 8 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 8 of 8 ------End------

Label and Location Size: L: 1.0cm*W: 0.2cm Label and Location FCC ID : 2BUN4-ACD3631

Shenzhen HTT Technology Co., Ltd. Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 1 of 6 Product Name: Wireless Earphones Model No.: ACD3631 Internal Photos of the EUT Left side Photo Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 2 of 6 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 3 of 6 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 4 of 6 Right side Photo Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 5 of 6 Report No.: HTT202608089 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 6 of 6 ------End------

Shenzhen HTT Technology Co., Ltd. Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 1 of 8 RF Exposure evaluation Report Reference No. ..................... : FCC ID............................................. : HTT202608089F02 2BUN4-ACD3631 Compiled by ( position+printed name+signature) . : File administrators Heber He Supervised by ( position+printed name+signature) . : Project Engineer Bruce Zhu Approved by ( position+printed name+signature) . : RF Manager Kevin Yang Date of issue .................................... : Aug. 10, 2026 Testing Laboratory Name .............. : Shenzhen HTT Technology Co.,Ltd. Address ............................................ : 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao’an District, Shenzhen, Guangdong, China Applicant’s name ............................ : Shenzhen Feizhou Digital Technology Co., Ltd Address ............................................ : Area C, 3F, Building 2, Taiming Industrial Zone, Xinniu Community, Minzhi, Longhua, Shenzhen, China Standard ........................................... : 47CFR §1.1310 47CFR §2.1093 KDB447498 D01 General RF Exposure Guidance v06 Shenzhen HTT Technology Co.,Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HTT Technology Co.,Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HTT Technology Co.,Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : Wireless Earphones Manufacturer .................................... : Shenzhen Futianda Electronics Co.,Ltd. Trade Mark ........................................ AOC Model/Type reference ...................... : ACD3631 Rating ............................................... : Headphone battery capacity:3.7V/30mAh (polymer battery) Charging bin battery capacity:3.7V/300mAh (polymer battery) Charging interface :USB Type-C Result ............................................... : PASS Report No.: HTT202608089F02 Page 2 of 8 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 2 of 8 T E S T R E P O R T Equipment under Test : Wireless Earphones Model /Type : ACD3631 Listed Models : N/A Applicant : Shenzhen Feizhou Digital Technology Co., Ltd Address : Area C, 3F, Building 2, Taiming Industrial Zone, Xinniu Community, Minzhi, Longhua, Shenzhen, China Manufacturer : Shenzhen Futianda Electronics Co.,Ltd. Address : Floor 3rd, Rongchang Industrial Park, Block A,Building7, No. 440, Heng Keng He Dong Village,Guancheng Community, Guanhu Street, Longhua District,518110 Shenzhen, Guangdong,China Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: HTT202608089F02 Page 3 of 8 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 3 of 8 Contents 1 T E S T S T A N D A R D S ................................................... 4 2 S U M M A R Y .............................................................. 5 2.1 General Remarks 5 2.2 Product Description 5 2.3 Special Accessories 5 2.4 Modifications 5 3 T E S T E N V I R O N M E N T 6 3.1 Address of the test laboratory 6 3.2 Test Facility 6 3.3 Statement of the measurement uncertainty 6 4 T E S T L I M I T 7 4.1 Requirement 7 4.2 Conducted Power Results 8 4.3 Manufacturing tolerance 8 4.4 Evaluation Result 8 4.5 Simultaneous Transmission for SAR Exclusion 8 5 C O N C L U S I O N .......................................................... 8 Report No.: HTT202608089F02 Page 4 of 8 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 4 of 8 1 T E S T S T A N D A R D S The tests were performed according to following standards: ANSI C95.1–1999: IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. FCC KDB 447498 D01 General RF Exposure Guidance v06: Mobile and Portable Device, RF Exposure, Equipment Authorization Procedures. FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits. FCC CFR 47 part2 2.1093: Radiofrequency radiation exposure evaluation: portable devices Report No.: HTT202608089F02 Page 5 of 8 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 5 of 8 2 S U M M A R Y 2.1 General Remarks Date of receipt of test sample : Aug. 04, 2026 Testing commenced on : Aug. 04, 2026 Testing concluded on : Aug. 10, 2026 2.2 Product Description Product description: Wireless Earphones Model/Type reference: ACD3631 Power supply: Headphone battery capacity:3.7V/30mAh (polymer battery) Charging bin battery capacity:3.7V/300mAh (polymer battery) Charging interface :USB Type-C Adapter Information: Model: GS-0500200 Input: AC100-240V, 50/60Hz, 0.3A max Output: DC 5V, 2A Testing sample ID： HTT202608089-1# (Engineer sample) HTT202608089-2# (Normal sample) Hardware version: / Softwar…

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1 Appendix RF Test Data for BT Company: : Shenzhen Feizhou Digital Technology Co., Ltd EUT : Wireless Earphones FCC ID: : 2BUN4-ACD3631 Model Number : ACD3631 Report No. : HTT202608089F01 Reviewed By : Heber He 2 1. Duty Cycle 1.1 Test Result 1.1.1 Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type T_on (ms) Period (ms) Duty Cycle (%) Duty Cycle Correction Factor (dB) Max. DC Variation (%) GFSK SISO 2402 DH5 2.913 3.749 77.70 1.10 0.01 2441 DH5 2.913 3.749 77.70 1.10 0.04 2480 DH5 2.913 3.749 77.70 1.10 0.01 Pi/4DQPSK SISO 2402 2DH5 2.919 3.749 77.86 1.09 0.04 2441 2DH5 2.919 3.750 77.84 1.09 0.07 2480 2DH5 2.920 3.751 77.85 1.09 0.03 8DPSK SISO 2402 3DH5 2.923 3.750 77.95 1.08 0.03 2441 3DH5 2.923 3.751 77.93 1.08 0.04 2480 3DH5 2.923 3.750 77.95 1.08 0.03 3 1.2 Test Graph 1.2.1 Ant1 GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV 4 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV 5 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV 6 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV 7 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV 8 2. Bandwidth 2.1 Test Result 2.1.1 OBW Mode TX Type Frequency (MHz) Packet Type ANT 99% Occupied Bandwidth (MHz) Verdict Result Limit GFSK SISO 2402 DH5 1 0.853 / Pass 2441 DH5 1 0.864 / Pass 2480 DH5 1 0.863 / Pass Pi/4DQPSK SISO 2402 2DH5 1 1.169 / Pass 2441 2DH5 1 1.162 / Pass 2480 2DH5 1 1.172 / Pass 8DPSK SISO 2402 3DH5 1 1.160 / Pass 2441 3DH5 1 1.176 / Pass 2480 3DH5 1 1.161 / Pass 2.1.2 20dB BW Mode TX Type Frequency (MHz) Packet Type ANT 20dB Bandwidth (MHz) Verdict Result Limit GFSK SISO 2402 DH5 1 0.924 / Pass 2441 DH5 1 0.924 / Pass 2480 DH5 1 0.927 / Pass Pi/4DQPSK SISO 2402 2DH5 1 1.299 / Pass 2441 2DH5 1 1.257 / Pass 2480 2DH5 1 1.258 / Pass 8DPSK SISO 2402 3DH5 1 1.264 / Pass 2441 3DH5 1 1.277 / Pass 2480 3DH5 1 1.268 / Pass 9 2.2 Test Graph 2.2.1 OBW GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV 10 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV 11 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV 12 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV 13 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV 14 2.2.2 20dB BW GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV 15 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV 16 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV 17 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV 18 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV 19 3. Maximum Conducted Output Power 3.1 Test Result 3.1.1 Power Mode TX Type Frequency (MHz) Packet Type Maximum Peak Conducted Output Power (dBm) Verdict ANT1 Limit GFSK SISO 2402 DH5 0.94 <=30 Pass 2441 DH5 0.44 <=30 Pass 2480 DH5 -0.52 <=30 Pass Pi/4DQPSK SISO 2402 2DH5 1.86 <=20.97 Pass 2441 2DH5 1.35 <=20.97 Pass 2480 2DH5 0.39 <=20.97 Pass 8DPSK SISO 2402 3DH5 2.60 <=20.97 Pass 2441 3DH5 2.08 <=20.97 Pass 2480 3DH5 1.12 <=20.97 Pass 20 4. Carrier Frequency Separation 4.1 Test Result 4.1.1 Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type Channel Separation (MHz) 20dB Bandwidth (MHz) Limit (MHz) Verdict GFSK SISO HOPP DH5 0.996 0.927 >=0.927 Pass Pi/4DQPSK SISO HOPP 2DH5 1.166 1.299 >=0.866 Pass 8DPSK SISO HOPP 3DH5 1.058 1.277 >=0.851 Pass 21 4.2 Test Graph 4.2.1 Ant1 GFSK_DH5_HOPP_Ant1_NTNV Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV 22 8DPSK_3DH5_HOPP_Ant1_NTNV 23 5. Number of Hopping Frequencies 5.1 Test Result 5.1.1 HoppNum Mode TX Type Frequency (MHz) Packet Type Num of Hopping Frequencies Verdict ANT1 Limit GFSK SISO HOPP DH5 79 >=15 Pass Pi/4DQPSK SISO HOPP 2DH5 79 >=15 Pass 8DPSK SISO HOPP 3DH5 79 >=15 Pass 24 5.2 Test Graph 5.2.1 HoppNum GFSK_DH5_HOPP_Ant1_NTNV Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV 25 8DPSK_3DH5_HOPP_Ant1_NTNV 26 6. Time of Occupancy (Dwell Time) 6.1 Test Result 6.1.1 Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type Duration of Single Pulse (ms) Observation Period (s) Num of Pulse in Observation Period Dwell Time (ms) Limit (ms) Verdict GFSK SISO HOPP DH1 0.414 31.600 320 132.480 <=400 Pass DH3 1.670 31.600 158 263.860 <=400 Pass DH5 2.920 31.600 95 277.400 <=400 Pass Pi/4DQPSK SISO HOPP 2DH1 0.422 31.600 320 135.040 <=400 Pass 2DH3 1.672 31.600 162 270.864 <=400 Pass 2DH5 2.924 31.600 103 301.172 <=400 Pass 8DPSK SISO HOPP 3DH1 0.422 31.600 320 135.040 <=400 Pass 3DH3 1.672 31.600 158 264.176 <=400 Pass 3DH5 2.926 31.600 110 321.860 <=400 Pass 27 6.2 Test Graph 6.2.1 Ant1 GFSK_DH1_HOPP_Ant1_NTNV GFSK_DH1_HOPP_Ant1_NTNV 28 GFSK_DH3_HOPP_Ant1_NTNV GFSK_DH3_HOPP_Ant1_NTNV 29 GFSK_DH5_HOPP_Ant1_NTNV GFSK_DH5_HOPP_Ant1_NTNV 30 Pi/4DQPSK_2DH1_HOPP_Ant1_NTNV Pi/4DQPSK_2DH1_HOPP_Ant1_NTNV 31 Pi/4DQPSK_2DH3_HOPP_Ant1_NTNV Pi/4DQPSK_2DH3_HOPP_Ant1_NTNV 32 Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV 33 8DPSK_3DH1_HOPP_Ant1_NTNV 8DPSK_3DH1_HOPP_Ant1_NTNV 34 8DPSK_3DH3_HOPP_Ant1_NTNV 8DPSK_3DH3_HOPP_Ant1_NTNV 35 8DPSK_3DH5_HOPP_Ant1_NTNV 8DPSK_3DH5_HOPP_Ant1_NTNV 36 7. Unwanted Emissions In Non-restricted Frequency Bands 7.1 Test Result 7.1.1 Ref Mode TX Type Frequency (MHz) Packet Type ANT Level of Reference (dBm) GFSK SISO 2402 DH5 1 0.67 2441 DH5 1 0.14 2480 DH5 1 -0.81 HOPP DH5 1 0.61 0.61 Pi/4DQPSK SISO 2402 2DH5 1 0.74 2441 2DH5 1 0.17 2480 2DH5 1 -0.82 HOPP 2DH5 1 0.61 0.61 8DPSK SISO 2402 3DH5 1 0.70 2441 3DH5 1 0.16 2480 3DH5 1 -0.76 HOPP 3DH5 1 0.81 0.81 7.1.2 CSE Mode TX Type Frequency (MHz) Packet Type ANT Level of Reference (dBm) Limit (dBm) Verdict GFSK SISO 2402 DH5 1 0.67 -19.33 Pass 2441 DH5 1 0.14 -19.86 Pass 2480 DH5 1 -0.81 -20.81 Pass HOPP DH5 1 0.61 -19.39 Pass 0.61 -19.39 Pass Pi/4DQPSK SISO 2402 2DH5 1 0.74 -19.26 Pass 2441 2DH5 1 0.17 -19.83 Pass 2480 2DH5 1 -0.82 -20.82 Pass HOPP 2DH5 1 0.61 -19.39 Pass 0.61 -19.39 Pass 8DPSK SISO 2402 3DH5 1 0.70 -19.30 Pass 2441 3DH5 1 0.16 -19.84 Pass 2480 3DH5 1 -0.76 -20.76 Pass HOPP 3DH5 1 0.81 -19.19 Pass 0.81 -19.19 Pass 37 7.2 Test Graph 7.2.1 Ref GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV 38 GFSK_D…

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Shenzhen HTT Technology Co., Ltd. Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China FCC PART 15 SUBPART C TEST REPORT FCC PART 15.247 Report Reference No. .................... : FCC ID. ........................................... : HTT202608089F01 2BUN4-ACD3631 Compiled by ( position+printed name+signature) . : File administrators Heber He Supervised by ( position+printed name+signature) . : Project Engineer Bruce Zhu Approved by ( position+printed name+signature) . : RF Manager Kevin Yang Date of issue .................................... : Aug. 10, 2026 Testing Laboratory Name .............. : Shenzhen HTT Technology Co.,Ltd. Address ............................................ : 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao’an District, Shenzhen, Guangdong, China Applicant’s name ........................... : Shenzhen Feizhou Digital Technology Co., Ltd Address ............................................ : Area C, 3F, Building 2, Taiming Industrial Zone, Xinniu Community, Minzhi, Longhua, Shenzhen, China Test specification ........................... : Standard ........................................... : FCC Part 15.247 Shenzhen HTT Technology Co.,Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HTT Technology Co.,Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HTT Technology Co.,Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : Wireless Earphones Trade Mark ....................................... : AOC Manufacturer .................................. : Shenzhen Futianda Electronics Co.,Ltd. Model/Type reference ...................... : ACD3631 Listed Models ................................... : N/A Modulation ....................................... : GFSK, Π/4DQPSK, 8DPSK Frequency ......................................... From 2402MHz to 2480MHz Ratings ............................................. : Headphone battery capacity:3.7V/30mAh (polymer battery) Charging bin battery capacity:3.7V/300mAh (polymer battery) Charging interface :USB Type-C Result ............................................... : PASS Report No.: HTT202608089F01 Page 2 of 45 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China T E S T R E P O R T Equipment under Test : Wireless Earphones Model /Type : ACD3631 Listed Models : N/A Applicant : Shenzhen Feizhou Digital Technology Co., Ltd Address : Area C, 3F, Building 2, Taiming Industrial Zone, Xinniu Community, Minzhi, Longhua, Shenzhen, China Manufacturer : Shenzhen Futianda Electronics Co.,Ltd. Address : Floor 3rd, Rongchang Industrial Park, Block A,Building7, No. 440, Heng Keng He Dong Village,Guancheng Community, Guanhu Street, Longhua District,518110 Shenzhen, Guangdong,China Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: HTT202608089F01 Page 3 of 45 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Contents 1 TEST STANDARDS .......................................................................................................................................... 4 2 SUMMARY ........................................................................................................................................................ 5 2.1 General Remarks .................................................................................................................................... 5 2.2 Product Description ................................................................................................................................. 5 2.3 Equipment Under Test ............................................................................................................................ 5 2.4 Short description of the Equipment under Test (EUT) ............................................................................ 5 2.5 EUT configuration .................................................................................................................................... 6 2.6 EUT operation mode ............................................................................................................................... 6 2.7 Block Diagram of Test Setup .................................................................................................................. 6 2.8 Related Submittal(s) / Grant (s) .............................................................................................................. 6 2.9 Modifications ........................................................................................................................................... 6 3 TEST ENVIRONMENT ...................................................................................................................................... 7 3.1 Address of the test laboratory ................................................................................................................. 7 3.2 Test Facility ............................................................................................................................................. 7 3.…

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2.4GHz 2012 Chip Antenna: RANT2012F245X07 Dimension(mm) L2.05+-0.10 W1.20+-0.10 T0.65+-0.10 No.TerminalName 1Feeding/GNG 2GND Application: WLAN,802.11b/g,Bluetooth,WLAN,etc... Features SMD,highreliability,ultraImpact,Omni-directional... PartnumberInformation RANT2012F245X (A)(B)(C)(D)(E) 07 (F) (A)ProductTypeChipAntenna (B)SizeCode2.0x1.2mm(+-0.2mm) (C)MaterialHighKmaterial (D)Frequency2.4~2.5GHz (E)FeedingmodePIFA&SingleFeeding (F)AntennatypeType=07 ElectricalSpecification WorkingFrequencyRange2400~2484MHz Bandwidth84(Min.) PeakGain2.7 dBi (Typ.) Impedance50Ohm Returnloss10dB(Min) PolarizationLinear AzimuthBeamwidthOmni-directional OperationTemperature( °C )-40~85 °C ResistancetoSolderingHeats 10sec.(@280°C) TerminationNi/Au(Leadless) ThespecificationisdefinedonEVB. DimensionandTerminalConfiguration 咏成國際科技有限公司電話 :13530576606 RAINInternationalTechnologyCo.,Ltd. 7/F,BuildingF,ZhichuangPark,Tong'an,Gushu,Shenzhen 2.4GHz 2012 Chip Antenna: RANT2012F245X07 EvaluationBoardReference PCBDimensionAntennaLayoutReferenceUnit:mm ElectricalCharacteristics ReturnLoss ReturnLoss&Radiation 1 Frequency(MHz) S11(dB) 2400-10.77 2450-24.81 2484-10.243 Radiation Z Y X 2400MHz2500MH 2450MHz z Efficiency70.56%75.25%71.01% 2.4GHz 2012 Chip Antenna: RANT2012F245X07 TapingSpecifications ReelandTapingSpecification ReelSpecification TYPESIZEABCD 20127”5K/Reel 9.0±0.5 60±213.5±0.5178±2 TappingSpecification PackagingTypeABWEFGHTDP PaperType2012 1.50±0.202.30±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.101.57±0.104.0±0.1 ReliabilityTabl 2.4GHz 2012 Chip Antenna: RANT2012F245X07 e TestItemProcedure Requirements CeramicType Remark (Reference) Electrical Characterization Fulfilltheelectrical specification UserSpec. Thermal Shock 1.Precondition…

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