2AN4C-1336Bluetooth Neckband

Rubber ear buds x4 Type-C cable x1 Rubber ear hooks x4 Earphone x1 Packing List Product Illustration User Guide x1 Choose Your Rubber Ear Buds/Rubber Ear Hooks Power On/Power Off Ear buds/Ear hooks(S/M/L 2 each) Power On: Press and hold the button for about 2 seconds until the LED indicator (white) flashes. Power Off: Press and hold the button for about 2 seconds the LED indicator (white) turns off. The body temperature is in normal range: the LED indicator flashes green (35.90°C-37.60°C or 96.60 °F-99.70°F). The body temperature is in abnormal range: the LED indicator flashes red. One of the following size S ear buds/ear hooks is attached. 1. Manually disconnecting and reconnecting the earphone will power off automatically if it is not connected to a Bluetooth device within 10 minutes. 2. Bluetooth connection when out of range: a. The earphone which was out of the Bluetooth range will automatically re-connect if it is back in the range, within 10 minutes of disconnection. b. After 10 minutes, the Bluetooth will have to be manually reconnected. c. After 20 minutes of disconnection outside the Bluetooth range,the earphone will power off. Disconnect and reconnect the Bluetooth When the earphone is in the pairing mode, press and hold the volume+ and volume- buttons for Delete "more than" 5 seconds until LED flashes red 3 times followed by 3 beeps. This procedure will clear the list of paired devices and resets all settings. The earbuds will need to be re-paired to your device. Factory Data Reset Charging 1. When the battery power is less than 10%, the LED will flash red with voice prompt every 60 seconds. 2. While charging, the battery indicator blinks red. 3. When the battery is fully charged, the battery indicator will be off. Notes: A. Charge the earphone via computer or certified charger(output 5v/ 500mA). A full charge powers the headphones for up to 2 hours. B. If the battery have not been charged for a long time, the lifespan or battery life can reduce. 1. Pause music and no call, double-click volume “+” button and a voice prompt “Body temperature and heart rate detection on”. Body Temperature/Heart Rate Monitoring Voice Prompts 1. Power on: “Power on”. 2. Pairing Successful: “Bluetooth connected”. 3. Pairing Failure: “Pairing failed”. 4. Low Battery: “Battery low” (<10%). 5. Bluetooth Pairing: “Bluetooth paring”. 6. Connection Failure: “Bluetooth disconnected”. 7. Power off: “Power off”. 8. Increase the sound “Beep”. 9. When a third-party call: “Beep beep” 10. Hang up the phone “Beep” 11. Calibration: “Temperature and heart rate calibrating” 12. Testing is on: “Body temperature and heart rate detection on” 13. Detection disconnected: “Body temperature and heart rate detection disconnected” 14. Successful test: “Temperature and heart rate detected successfully” 15. Failed detection: “Temperature and heart rate detection failed” 16. Searching: “Body temperature and heart rate searching” 17. Re-detection: “Please put on your headphones” 18. Adjust the earphone: “Please adjust your headphones” 19. Heart rate broadcast: “heart rate**” 20. Body temperature broadcast: “body temperature**” ©2020 Shenzhen Grandsun Electronics Co., Ltd. SENSE LED Indicator Power button (L侧) R(Right) Microphone Rechargeable battery L(Left) Pairing Your Mobile Device Press and hold the on button for 2 seconds until you hear the voice prompt "power on" and the earphone will automatically reconnect to the last device you use with them. Pair and connect for the first time Turn on to reconnect 2. Go to the bluetooth setting on your device, search and connect "233621 Sense". Notes: The earphone will be powered off within 10 minutes, if there is no device connected to it. When the headset is in the pairing mode, and if there is no mobile phone connection made within 5 minutes, it will prompt “Device not found”, and exit the pairing mode. White Led will flash for 5 more minutes before switching off. 1. Press and hold the button about 5 seconds. Swith from one device to other 1. Hold the on button for 5 seconds until you hear "Looking for device" and the indicator LED flashes red and white alternatively. 2. Open the Bluetooth menu on your ios or Android device, search and connect with "233621 Sense". Wear Headphones Rotate the earphone to a comfortable position. Pull-in stateSeparate state LED Indicator Google Bisto Button Type-C port Volume + (power/play/call) button Volume - (M)(L)(M)(L) →→ → double-click Body temperature heart rate detection has started ① After the test is turned on, the voice prompts “Body temperature and heart rate search”, and start to get the body temperature/ Heart rate data. ② If the data acquisition fails, there will be two different situations: a. No number can be acquired, the voice prompt“please put on the headphone”. b. The data is abnormal, the voice prompt“Please adjust the headphone”. ③ Start to gather data , the voice prompt “temperature and heart rate calibration is in progress”, there will be two cases as follows: a. Calibration is succeeded, the voice prompts “Body temperature and heart rate detection Succeeded”. b. Calibration failed, voice prompt “Failed to detect body temperature and heart rate”, the detection function of the earphone will automatically restart. start to get the data a. Temperature and heart rate detected successfully Temperature and heart rate calibrating b. Temperature and heart rate detection failed a. Please put on your headphone b. Please adjust your headphone Listen To Music Specification Model number: 233621 ® Sense Speaker size: 5.8mm speaker Audio decoding: SBC, aptX-HD Frequency response range: 20-20kHz (Bluetooth) Connection method: USB-C to USB-A charging cable Support mode: BT 5.1, HSP v1.2, HFP v1.7.1, A2DP v1.3.1, AVRCP v1.6 Bluetooth frequency: 2.402-2.480GHz Bluetooth power: <8.0dBm Battery specifications: Rechargeable polymer lithium ion battery (3.7V, 130 mAh) Charging time: 2 hours Earphone usage time: 10 hours Waterproof level: IPX5 Product …

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Shenzhen Grandsun Electronic Co.,Ltd. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date: 2020-09-18 Subject; Request for Long Term Confidentiality FCC ID: 2AN4C-1336 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Operational Description It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Felix Lee Title: Project Manager

Shenzhen Grandsun Electronic Co.,Ltd. Letter of Authorization Company: Shenzhen Grandsun Electronic Co.,Ltd. Address: Gaoqiao Industry Zone,Pingdi Town,Longgang District,Shenzhen,China Product Name: Bluetooth Neckband Model Number: 233621 SENSE FCC ID: 2AN4C-1336 We authorize MiCOM Labs Inc, 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the above named equipment. Any individual within MiCOM Labs is authorized to act on our behalf and take action on the application. We declare that MiCOM Labs Inc, 575 Boulder Court, Pleasanton, California 94566, USA, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Name: Felix Lee Date: 2020-09-18 Title: Project Manager

7.EXTERANAL AND INTERNAL PHOTOS External photos of EUT Model:233621 SENSE

Label & Location The label will be on the line label of the product

FCC ID: 2AN4C-1336 RF Exposure Evaluation REQUIREMENT KDB447498 D01 General RF Exposure Guidance v06, Clause 4.3.1(a) [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3 Where -f(GHz) is the RF channel transmit frequency in GHz -Power and distance are rounded to the nearest mW and mm before calculation -The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm, and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 4.1 f) is applied to determine SAR test exclusion. TEST RESULT Passed Not Applicable Type Maximum Tune-up (dBm) Conducted Average Power BT-EDR 2.74~4.74 BT-BLE 2.47~3.47 Type Conducted Average Power (dBm) Maximum Tune-up (dBm) Calculating data Limit Result BT EDR 4.74 5.00 0.987 3 Pass BT BLE 3.47 4.00 0.785 3 Pass Note: 1) The maximum antenna gain is 1.25dBi 2) The exposure evaluation safety distance is 5mm.

Page: 1 of 38 TEST REPORT Report No. ...................................... : CHTEW20090088 Report Verification: Project No.................................： SHT2008085403EW FCC ID ............................................. : 2AN4C-1336 Applicant’s name ........................... : Shenzhen Grandsun Electronic Co.,Ltd. Address ............................................. : Gaoqiao Industry Zone,Pingdi Town,Longgang District,Shenzhen,China Manufacturer.....................................: Shenzhen Grandsun Electronic Co.,Ltd. Address..............................................: Gaoqiao Industry Zone,Pingdi Town,Longgang District,Shenzhen,China Test item description .................... : Bluetooth Neckband Trade Mark ....................................... : 233621 Model/Type reference ....................... : 233621 SENSE Listed Model(s) ................................. : - Standard ......................................... : FCC CFR Title 47 Part 15 Subpart C Section 15.247 Date of receipt of test sample..........: Aug. 24, 2020 Date of testing.............................: Aug. 25, 2020- Sep. 15, 2020 Date of issue...............................: Sep. 16, 2020 Result .................. ........................: PASS Compiled by ( Position+Printed name+Signature): File administrator Silvia Li Supervised by (Position+Printed name+Signature): Project Engineer Xiao Cheng Approved by (Position+Printed name+Signature): RF Manager Hans Hu Testing Laboratory Name ............. : Shenzhen Huatongwei International Inspection Co., Ltd. Address ............................................. : 1/F, Bldg 3, Hongfa Hi-tech Industrial Park, Genyu Road, Tianliao, Gongming, Shenzhen, China Shenzhen Huatongwei International Inspection Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Huatongwei International Inspection Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen Huatongwei International Inspection 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. The test report merely correspond to the test sample. Report No.: CHTEW20090088 Page: 2 of 38 Issued: 2020-09-16 Shenzhen Huatongwei International Inspection Co., Ltd. Report Template Version: V02 (2019-10) Contents 1. TEST S T AN D AR D S A N D R E P O R T V E R S I O N 3 1.1. Test Standards 3 1.2. Report version 3 2. TEST DESCRIPTION 4 3. SUMMARY 5 3.1. Client Information 5 3.2. Product Description 5 3.3. Radio Specification Description 5 3.4. Testing Laboratory Information 6 4. TEST CONFIGURATION 7 4.1. Test frequency list 7 4.2. Descriptions of Test mode 7 4.3. Test mode 7 4.4. Support unit used in test configuration and system 8 4.5. Testing environmental condition 8 4.6. Measurement uncertainty 8 4.7. Equipment Used during the Test 9 5. TEST CONDITIONS AND RESULTS 11 5.1. Antenna Requirement 11 5.2. AC Conducted Emission 12 5.3. Peak Output Power 15 5.4. 20 dB Bandwidth 16 5.5. 99% Occupied Bandwidth 17 5.6. Carrier Frequencies Separation 18 5.7. Hopping Channel Number 19 5.8. Dwell Time 20 5.9. Duty Cycle Correction Factor (DCCF) 21 5.10. Pseudorandom Frequency Hopping Sequence 22 5.11. Conducted Band edge and Spurious Emission 23 5.12. Radiated Band edge Emission 25 5.13. Radiated Spurious Emission 27 6. TEST SETUP PHOTOS 32 7. EXTERANAL AND INTERNAL PHOTOS 33 8. APPENDIX REPORT 38 Report No.: CHTEW20090088 Page: 3 of 38 Issued: 2020-09-16 Shenzhen Huatongwei International Inspection Co., Ltd. Report Template Version: V02 (2019-10) 1. TEST STAND ARDS AND REPORT VERSION 1.1. Test Standards The tests were performed according to following standards: ‒ FCC Rules Part 15.247: Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz ‒ ANSI C63.10:2013: American National Standard for Testing Unlicensed Wireless Devices ‒ KDB 558074 D01 15.247 Meas Guidance v05r02: Guidance for Compliance Measurements on Digital Transmission System, Frequency Hopping Spread Spectrum System, and Hybrid System Devices Operating under Section 15.247 of The FCC Rules 1.2. Report version Revision No. Date of issue Description N/A 2020-09-16 Original Report No.: CHTEW20090088 Page: 4 of 38 Issued: 2020-09-16 Shenzhen Huatongwei International Inspection Co., Ltd. Report Template Version: V02 (2019-10) 2. TEST DESCRIPTION Report clause Test Items Standard Requirement Result 5.1 Antenna Requirement 15.203/15.247 (c) PASS 5.2 AC Conducted Emission 15.207 PASS 5.3 Peak Output Power 15.247 (b)(1) PASS 5.4 20 dB Bandwidth 15.247 (a)(1) PASS 5.5 99% Occupied Bandwidth - PASS *1 5.6 Carrier Frequency Separation 15.247 (a)(1) PASS 5.7 Hopping Channel Number 15.247 (a)(1) PASS 5.8 Dwell Time 15.247 (a)(1) PASS 5.9 Duty Cycle Correction Factor - PASS *1 5.10 Pseudorandom Frequency Hopping Sequence 15.247(b)(4) PASS 5.11 Conducted Band Edge and Spurious Emission 15.247(d)/15.205 PASS 5.12 Radiated Band Edge Emission 15.205/15.209 PASS 5.13 Radiated Spurious Emission 15.247(d)/15.205/15.209 PASS Note: ‒ The measurement uncertainty is not included in the test result. ‒ *1: No requirement on standard, only report these test data. Report No.: CHTEW20090088 Page: 5 of 38 Issued: 2020-09-16 Shenzhen Huatongwei International Inspection Co., Ltd. Report Template Version: V02 (2019-10) 3. SUMMARY 3.1. Client Information Applicant: Shenzhen Grandsun Electronic Co.,Ltd. Address: Gaoqiao Industry Zone,Pingdi Town,Longgang District,Shenzhen,China Manufacturer: Shenzhen Grandsun Electronic Co.,Ltd. Address: Gaoqiao Industry Zone,Pingdi Town,Longgang District,Shenzhen,China 3.2. Product Description Name of EUT: Bluetooth Neckband Trade Mark: 233621 Model No.: 233621 SENSE Listed Model(s): - Power supply: 5V DC Adapter: Model:SICO More 3 Input：100-240,50/60…

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Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 1 of 41 APPENDIX REPORT Project No. SHT2008085403EW Radio Specification Bluetooth EDR Test sample No. Model No. GS-1326 Start test date 2020/8/27 Finish date 2020/8/27 Temperature 25°C Humidity 50% Test Engineer Jiongsheng.Feng Auditor Appendix clause Test item Result A Peak Output Power PASS B 20 dB Bandwidth PASS C 99% Occupied Bandwidth PASS D Carrier Frequencies Separation PASS E Hopping Channel Number PASS F Dwell Time PASS G Duty Cycle Correction Factor (DCCF) PASS H Band edge and Spurious Emissions(coducted) PASS Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 2 of 41 Appendix A：Peak Output Power Modulation type Channel Output power (dBm) Average Output power (dBm) Limit (dBm) Result GFSK 00 3.41 3.40 ≤ 30.00 Pass 39 4.74 4.73 78 4.14 4.11 π/4DQPSK 00 3.28 1.15 ≤ 21.00 Pass 39 3.09 1.04 78 2.49 0.82 8DPSK 00 3.38 1.27 ≤ 21.00 Pass 39 3.19 1.11 78 2.67 0.96 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 3 of 41 Modulation Type: GFSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 4 of 41 Modulation Type: π/4DQPSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 5 of 41 Modulation Type: 8DPSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 6 of 41 Appendix B : 20 dB Bandwidth Modulation type Channel 20 dB Bandwidth (kHz) Limit (kHz) Result GFSK 00 932.50 - Pass 39 932.50 78 932.50 π/4DQPSK 00 1362.50 - Pass 39 1362.50 78 1365.00 8DPSK 00 1302.50 - Pass 39 1302.50 78 1305.00 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 7 of 41 Modulation Type: GFSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 8 of 41 Modulation Type: π/4DQPSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 9 of 41 Modulation Type: 8DPSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 10 of 41 Appendix C：99% Occupied Bandwidth Modulation type Channel 99% Occupied Bandwidth (MHz) Limit (MHz) Result GFSK 00 0.92 - Pass 39 0.93 78 0.93 π/4DQPSK 00 1.20 - Pass 39 1.20 78 1.20 8DPSK 00 1.18 - Pass 39 1.19 78 1.19 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 11 of 41 Modulation Type: GFSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 12 of 41 Modulation Type: π/4DQPSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 13 of 41 Modulation Type: 8DPSK CH00 CH39 CH78 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 14 of 41 Appendix D：Carrier Frequencies Separation Modulation type Channel Carrier Frequencies Separation (MHz) Limit (kHz) * Result GFSK 39 1.00 ≥932.50 Pass π/4DQPSK 39 1.01 ≥910.00 Pass 8DPSK 39 1.00 ≥870.00 Pass Note: *: GFSK limit = The maximum 20 dB Bandwidth for GFSK modulation on the appendix B. π/4DQPSK limit = 2/3 * The maximum 20 dB Bandwidth for π/4DQPSK modulation on the appendix B. 8DPSK limit = 2/3 * The maximum 20 dB Bandwidth for 8DPSK modulation on the appendix B Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 15 of 41 GFSK π/4DQPSK 8DPSK Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 16 of 41 Appendix E：Hopping Channel Number Modulation type Channel number Limit Result GFSK 79 ≥15.00 Pass π/4DQPSK 79 8DPSK 79 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 17 of 41 GFSK π/4DQPSK 8DPSK Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 18 of 41 Appendix F：Dwell Time Modulation type Packet Burst Width [ms] Total Hops[hop*ch] Dwell time (Second) Limit (Second) Result GFSK DH1 0.39 317 0.12 ≤ 0.40 Pass DH3 1.65 174 0.29 DH5 2.90 101 0.29 π/4DQPSK 2DH1 0.40 321 0.13 ≤ 0.40 Pass 2DH3 1.66 160 0.27 2DH5 2.90 126 0.37 8DPSK 3DH1 0.40 321 0.13 ≤ 0.40 Pass 3DH3 1.65 161 0.27 3DH5 2.90 108 0.31 Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 19 of 41 Modulation Type: GFSK DH1 Burst width DH1 Burst number DH3 Burst width Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 20 of 41 DH3 Burst number DH5 Burst width DH5 Burst number Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR Shenzhen Huatongwei International Inspection Co., Ltd. Appendix report page: 21 of 41 Modulation Type: π/4DQPSK 2DH1 Burst width 2DH1 Burst number 2DH3 Burst width Project No.: SHT2008085403EW Radio Specification: Bluetooth EDR She…

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6.TEST SETUP PHOTOS Radiated Emission AC Conducted Emission M odel:233621 SENSE