2A63XKST-801ANCWireless headphone

User’s Manual Buttons and Sockets Functions Indicator Power ON/OFF(Press and Hold) Play/ Pause Volume - / Previous Song Volume + / Next Song Type-C Charging Socket 3.5mm Audio-in Socket Built-in Phone call Mic Noise Cancelling ON/OFF ② ① ③ ④ ⑤ ⑥ ⑦ ⑧ ON OFF Specification Headphone Operation Bluetooth Mode 1. Press and hold button② into pairing mode, indicator⑧ red-blue flicker. 2. Open device’s bluetooth function, select ‘’ANC headphone’’. 3. Waiting the headset automatically pair. The indicator⑧ will change blue after pairing success. 4. The device plays audio. Button operation in Bluetooth mode: When headphone play music: Indicator⑧: Blue slow flicker Button②: Play / Pause Button①: Volume + / Next Song Button③: Volume - / Previous Song Button④: Noise Cancelling ON/OFF When the call comes: Button②: Click Answer / Press and Hold Hang Up Wired Headphone Mode Utilize an audio cable to connect the headset to the audio device as depicted in the illustration. It can function similarly to a wired headset. (The button functionality is not operational when utilizing the wired headset feature) Headphone Charging The headphone will emit a beeping sound when the battery is running low . Utilize the USB charging cable to connect the 5V adapter to charging port⑤. when connected, the charging indicator⑧ will turn red. Once fully charged, the red indicator light change to blue and light off after 10 seconds. Package Include 1 x Headphone, 1 x Charging cable, 1 x 3.5mm Audio cable, 1 x User’s manual Headphone connect smartphone or other Bluetooth device: Press and hold Red-blue flicker ON OFF Bluetooth ANC headphone Open bluetooth ,then select ‘’ANC headphone’’ Device Change Blue ON OFF Note: To pair a new product or transmitter, disable orther devices’ Bluetooth function. 3.5mm Audio Cable 3.5mm Audio-out Devices 3.5mm Headphone socket Wireless Headphone Charging Cable Indicator Red: Charging Light off: Complete Device’s USB power supply Voltage 5V 5V USB USB adapter Voltage 5V (Not included in the product, Should be purchased separately) Model： Version： Profile： Range： Frequency： Speaker Size： Sensi�vity： Impedance： Anc Depth： KST-801ANC V5.3 HSP/HFP/A2DP/AVRCP ≤10m 20hz~20khz 40mm 102±3dB 32Ω 20±3dB Paired name: Charge Input： Ba�ery： Charge Voltage： Charge Time： Play Time： Talke Time： Only Anc Time: Audio-in： ANC headphone Type-C 300mAh 5V 2 hours ≥ 15 hours ≥ 15 hours 20 hours 3.5mm audio-in port This device complies with part 15 of the FCC Rules. Opera�on is subject to the following two condi�ons: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired opera�on. FCC warning: Any Changes or modifica�ons not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protec�on against harmful interference in a residen�al installa�on. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruc�ons, may cause harmful interference to radio communica�ons. However, there is no guarantee that interference will not occur in a par�cular installa�on. If this equipment does cause harmful interference to radio or television recep�on, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -Reorient or relocate the receiving antenna. -Increase the separa�on between the equipment and receiver. -Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -Consult the dealer or an experienced radio/TV technician for help. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condi�on without restric�on. User’s Manual Buttons and Sockets Functions Indicator Power ON/OFF(Press and Hold) Play/ Pause Volume - / Previous Song Volume + / Next Song Type-C Charging Socket 3.5mm Audio-in Socket Built-in Phone call Mic Noise Cancelling ON/OFF ② ① ③ ④ ⑤ ⑥ ⑦ ⑧ ON OFF Specification Package Include 1 x Headphone, 1 x Charging cable, 1 x 3.5mm Audio cable, 1 x User’s manual Wireless Headphone Model： Version： Profile： Range： Frequency： Speaker Size： Sensi�vity： Impedance： Anc Depth： KST-801ANC V5.3 HSP/HFP/A2DP/AVRCP ≤10m 20hz~20khz 40mm 102±3dB 32Ω 20±3dB Paired name: Charge Input： Ba�ery： Charge Voltage： Charge Time： Play Time： Talke Time： Only Anc Time: Audio-in： ANC headphone Type-C 300mAh 5V 2 hours ≥ 15 hours ≥ 15 hours 20 hours 3.5mm audio-in port

Declaration on model difference We The following models of units we produce are identical in electrical, mechanical and physical structure; The difference is only in the model name, we finally have KST-801ANC as test model. FCCID: 2A63XKST-801ANC Production name Trade name Model no. Wireless headphone N/A KST-801ANC,KST-801+TX2,KST-801+BT,KST- 620ANC,KST-620+TX3,KST-900,KST-901,KST- 800 Signature: Date: 2025/10/09 Name: Kunta Chen Title: Manager Company: Shenzhen Huijinzhicheng Technology Co.,Limited

(Shenzhen Huijinzhicheng Technology Co.,Limited) 2025/10/09 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (FCC ID: 2A63XKST-801ANC) [Shenzhen Huijinzhicheng Technology Co.,Limited] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, Client’s signature: Client’s name / title : Kunta Chen / Manager Contact information / address: Room 357, 3rd Floor, No. 330, Pinghu Street, Longgang District, Shenzhen China (Shenzhen Huijinzhicheng Technology Co.,Limited) 2025/10/09 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (FCC ID: 2A63XKST-801ANC) [Shenzhen Huijinzhicheng Technology Co.,Limited] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, Client’s signature: Client’s name / title : Kunta Chen / Manager Contact information / address: Room 357, 3rd Floor, No. 330, Pinghu Street, Longgang District, Shenzhen China

Shenzhen Huijinzhicheng Technology Co.,Limited 2025.10.09 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR Product Name: Wireless headphone FCCID: 2A63XKST-801ANC Model(s): KST-801ANC,KST-801+TX2,KST-801+BT,KST-620ANC,KST-620+TX3,KST- 900,KST-901,KST-800 To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the - Block Diagram - Schematics - Operational Description required to be submitted with this application be permanently withheld from public review. The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. Please contact me if there is any information you may need. Sincerely, Client’s signature: Client’s name / title : Kunta Chen / Manager Contact information / address: Room 357, 3rd Floor, No. 330, Pinghu Street, Longgang District, Shenzhen China

Shenzhen Huijinzhicheng Technology Co.,Limited 2025.10.09 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION Product Name: Wireless headphone FCCID: 2A63XKST-801ANC Model(s): KST-801ANC,KST-801+TX2,KST-801+BT,KST-620ANC,KST-620+TX3,KST- 900,KST-901,KST-800 To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen BCTC Testing Co., Ltd to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Client’s signature: Client’s name / title : Kunta Chen / Manager Contact information / address: Room 357, 3rd Floor, No. 330, Pinghu Street, Longgang District, Shenzhen China

External Photos

Size:20*20mm Product Name: Wireless headphone Model: KST-801ANC FCC ID:2A63XKST-801ANC Label location

Internal Photos Ant

FCC ID: 2A63XKST-801ANC RF exposure evaluation According to§15.247(i), §1.1307 (b) and KDB447498, systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the commission’s guidance. The SAR-based exemption formula of §1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold Pth (mW). This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). Pth is given by Formula (B.2). F is in GHz, d is the separation distance (cm), and ERP20cm is per Formula (B.1). When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. We use 5mm as separation distance to calculate BT Antenna Gain: 2.83632dBi Conducted Transmit Power Max: = -0.05dBm = 0.99mW EIRP=-0.05dBm+2.83632dBi=2.78632dBm ERP= 2.78632-2.15dB=0.63632dBm The maximun ERP power specified is 0.63632dBm = 1.16mW The source- based time-averaging conducted output power =1.16* Duty factor mW (where Duty Factor≤1) =1.16mW The SAR Exclusion Threshold Level: 푃 th (mW) = ERP 20cm * (푑/20cm) 푥 (X= ) = 2.72 mW Since the source-based time-averaging conducted output power is well below the SAR low threshold level, so the EUT is considered to comply with SAR requirement without testing.

Summary ITEM Model Name 2400Mhz2450Mhz2500Mhz2400Mhz2450Mhz2500Mhz 2.751682.836322.630271.13181.74952.3976 MAX.Gain Polarization Azimuth Beam pattern Impedance Antenna Length Manufacture Antenna Photo & Length(mm) Horizontal:2400MHz 2450MHz 2500MHz Horizontal and Vertical Omni-directional 50 Ohm 7.3mm Shenzhen Junyue Internet Technology Co., Ltd Inverted F Antenna Specification ANT SPEC 2.4G onboardANT HorizontalVertical 2.83632dBi Center Frequency Power(dBi) Max:8 Min:-40 Scale:5/div Frequency(MHz) (MHz) 2400 2450 2500 Vertical:2400MHz 2450MHz 2500MHz Power(dBi) Max:8 Min:-30 Scale:5/div 2.83632-26.4975-2.86975 2.63027-20.0188-2.77921 MaxMinAvg 2.75168-25.0717-2.45237 Gain(dBi) Frequency(MHz) (MHz) 2400 2450 2500 1.7495-22.5492-2.6795 2.3976-25.4803-3.7529 Gain(dBi) MaxMinAvg 1.1318-18.1497-5.0331

No.：BCTC/RF-ICT-005 Page: 1 of 63 Edition：C.0 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2508431729-1E Applicant: Shenzhen Huijinzhicheng Technology Co.,Limited Product Name: Wireless headphone Test Model: KST-801ANC Tested Date: 2025-08-06 to 2025-08-22 Issued Date: 2025-11-19 Report No.:BCTC2508431729-1E No.：BCTC/RF-ICT-005 Page: 2 of 63 Edition：C.0 FCC ID:2A63XKST-801ANC The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen BCTC Testing Co., Ltd, this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. Product Name: Wireless headphone Trademark: N/A Model/Type Reference: KST-801ANC,KST-801+TX2,KST-801+BT,KST-620ANC,KST-620+TX3,KST-900, KST-901,KST-800 Prepared For: Shenzhen Huijinzhicheng Technology Co.,Limited Address: Room 357, 3rd Floor, No. 330, Pinghu Street, Longgang District, Shenzhen China Manufacturer: Shenzhen Huijinzhicheng Technology Co.,Limited Address: Room 357, 3rd Floor, No. 330, Pinghu Street, Longgang District, Shenzhen China Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1 st Road, Zhancheng, Fuhai Subdistrict, Bao’an District, Shenzhen, Guangdong, China Sample Received Date: 2025-08-06 Sample Tested Date: 2025-08-06 to 2025-08-22 Report No.: BCTC2508431729-1E Test Standards FCC Part15.247 ANSI C63.10-2020 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Brave Zeng/ Project Handler Zero Zhou/Reviewer Report No.:BCTC2508431729-1E No.：BCTC/RF-ICT-005 Page: 3 of 63 Edition：C.0 Table of Content Test Report Declaration Page 1. Version .................................................................................................................. 5 2. Test Summary ....................................................................................................... 6 3. Measurement Uncertainty ..................................................................................... 7 4. Product Information and Test Setup ...................................................................... 8 4.1 Product Information ............................................................................................... 8 4.2 Test Setup Configuration ...................................................................................... 8 4.3 Support Equipment ............................................................................................... 9 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ........................................................................................................... 10 4.6 Table Of Parameters Of Text Software Setting ................................................... 10 5. Test Facility And Test Instrument Used ............................................................... 11 5.1 Test Facility ......................................................................................................... 11 5.2 Test Instrument Used .......................................................................................... 11 6. Conducted Emissions .......................................................................................... 13 6.1 Block Diagram Of Test Setup .............................................................................. 13 6.2 Limit .................................................................................................................... 13 6.3 Test procedure .................................................................................................... 13 6.4 EUT operating Conditions ................................................................................... 13 6.5 Test Result .......................................................................................................... 14 7. Radiated emissions ............................................................................................. 16 7.1 Block Diagram Of Test Setup .............................................................................. 16 7.2 Limit .................................................................................................................... 17 7.3 Test procedure .................................................................................................... 18 7.4 EUT operating Conditions ................................................................................... 19 7.5 Test Result .......................................................................................................... 20 8. Radiated Band Emission Measurement and Restricted Bands of Operation ...... 25 8.1 Block Diagram Of Test Setup .............................................................................. 25 8.2 Limit .................................................................................................................... 25 8.3 Test procedure .................................................................................................... 26 8.4 EUT operating Conditions ................................................................................... 26 8.5 Test Result .......................................................................................................... 27 9. Spurious RF Conducted Emissions ..................................................................... 28 9.1 Block Diagram Of Test Setup .............................................................................. 28 9.2 Limit .................................................................................................................... 28 9.3 Test procedure .................................................................................................... 28 9.4 Test Result .......................…

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TEST SETUP PHOTOGRAPHS Conducted Emission Measurement Photos Radiated Measurement Photos ----------------The end----------------