2AB5T-APEXPROTWS BLUETOOTH EARBUDS

User Guide EN Danger To avoid harm your hearing, do not listen at high volume for a long time. Please adjust the volume to a safe range. If the earbuds volume is too high, the use time should be shortened. ● Listening Safety Charge the charging case • Charge the battery with the provided USB Type-C cable. The charging time is about 1.5 hours. • Charge the battery with a wireless charger. • The charging time is about 1.5 hours. * Use USB Type-C cable and wireless charger to charge at the same time, the wireless charger is preferred Charging case Indicators ● Battery charge ● Secure Fit Charge the earbuds • Remove the film on the earbuds when taking them out of the battery charging case for the first time. • Put the earbuds into the charging case and automatically charge when closing the charging case. The charging time is about 1.5 hours. * This product adopts the magnet contact charging 1. Please check the "L" and "R" (See details of pairing method on the manual) 2. Put the earbuds on your ears. Please adjust the angle according to your ears and make sure they fit in the ear securely and comfortably. Active noise cancelling(ANC) earbuds (left x1 right x1) Earbuds charging case x1 USB Type-C cable x1 Ear tips x 6 pairsL/M/S size User guide x1 User guide NOTICE card x1 ●Packing Contents ●Product Introduction Voice assistant (Google/Siri) In the paired status, triple-tap the earbuds touch panel. Answer the call In the incoming call status, double-tap the earbuds touch panel. Hang up the call In the phone call status, double-tap the earbuds touch panel. Reject the call In the incoming call state, long-press the earbuds touch panel 2s. Pause/play music When connected, double-tap the earbuds touch panel. Power ON • Open the charging case cover and the earbuds automatically power on. • Long press touch panel 3s to power on. • Earbuds LED indicator light in green 1s and then goes out. Power OFF • Put the earbuds into the charging case, earbuds will automatically power off after closing the charging case cover. • When the earbuds power on, if there is no device connected, it will automatically power off after 5 minutes. • Earbuds LED indicator light in green for 1s and then goes out. 1. Open the charging case and remove the earbuds 2. The left and right earbud automatically power on and pair, Until the left LED indicator light off, the right LED indicator light flashes in green, the earbuds pairing successful. 3. Open the device Bluetooth search "COWIN Apex Pro" and click to finish connect. 4. If the connection fails, put the earbuds back in the charging case and repeat the above steps. If you still have any questions, please contact our after-sales service center and we will provide you with 24-hour service. E-mail: [email protected] Phone: +1(929)359-6668 (Mon-Fri 9:00 a.m. to 17:30 p.m. PST) Recommend Website: https://www.cowinaudio.com (Support live chat) Facebook: https://www.facebook.com/cowinelectronics Instagram: https://www.instagram.com/cowinaudio Youtube: https://www.youtube.com/channel/UCQIHuG8eYKa8AFyzOa98RiA Twitter: https://twitter.com/cowinaudio If you still have any questions, please contact our after-sales service center and we will provide you with 24-hour service. E-mail: [email protected] Phone: +1(929)359-6668 (Mon-Fri 9:00 a.m. to 17:30 p.m. PST) Recommend Website: https://www.cowinaudio.com (Support live chat) Facebook: https://www.facebook.com/cowinelectronics Instagram: https://www.instagram.com/cowinaudio Youtube: https://www.youtube.com/channel/UCQIHuG8eYKa8AFyzOa98RiA Twitter: https://twitter.com/cowinaudio Battery display sync Support IOS/Android mobile phone displays the earbuds battery level near the upper right corner of the screen. Clear Bluetooth pairing record * Long press the multi-function button of the charging case for 10S to reset all settings. The charging case LED indicator light flashes slowly in white. * Long press the multifunction button of the charging case for 3S to forcibly disconnect the currently connected device and enter the pairing state, The charging case LED indicator light flashes fast in white. ● Power ON/OFF● Noise Cancelling & Ambient Sound ● Bluetooth Connection Power ONPower OFF COWIN Apex Pro - 01 -- 02 -- 03 -- 04 - - 07 -- 08 -- 09 -- 10 - - 05 -- 06 - ● Product Parameters Product Model: COWIN Apex Pro Noise Reduction Depth: 33db Bluetooth Version: V5.0 Audio Codec: HFP/HSP/A2DP/AVRCP/SPP/PBAP Working Distance: ≥ 10M Voice Support: Status prompt Waterproof Rating: IPX7 Working Time: Music playback 5H, talk time 5H Charging Time: Charging case 1.5H, earbuds 1.5H Battery Capacity: 400mAH, Single earbud 55mAH Speakers: φ10mm, 32Ω, S/N: ≥100dB Working Current: 9mA ● FAQ● Touch Panel Command 1. If the earbuds do not function as expected, try the following steps to resolve the issue. • Find the symptoms of the issue in this User Guide, and try any corrective actions listed. • Charge the battery: You may be able to resolve some issues by charging the battery. • Initialize the earbuds: This operation resets the earbuds to the factory settings and deletes all pairing information. • Look up information on the issue on the customer support. 2. Clear Bluetooth pairing record. • Long press the multi-function button of the charging case for 10S to reset all settings. • Long press the multifunction button of the charging case for 3S to forcibly disconnect the currently connected device and enter the pairing state. 3. Only one earbud worked. Earbuds are currently or had already been connected to a Bluetooth device, click forget or remove "COWIN Apex" from your Bluetooth settings and turn off your device Bluetooth settings. • Put the earbuds into the charging case, clear Bluetooth pairing record. • The left LED indicator light off, the right LED indicator light flashes green, the earbuds pairing successful. • Then remove the earbuds, activate your device Bluetooth to connect earbuds. 4. Can't power on the Bluetooth earbuds. • The battery …

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Shenzhen MeiDong Acoustics Co., LTD Agent Authorization Company: Shenzhen MeiDong Acoustics Co., LTD Address: Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China Product Name: TWS BLUETOOTH EARBUDS Model Number(s): COWIN Apex Pro Product Description: TWS BLUETOOTH EARBUDS We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required 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. Signature: Date: 2020/12/30 Name: Huang ping hua Title: Manager Company: Shenzhen MeiDong Acoustics Co., LTD

Shenzhen MeiDong Acoustics Co., LTD Authorization Letter We, (the approval holder) Company name Shenzhen MeiDong Acoustics Co., LTD Addresss Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China declare that the following representative (agent): Name (person) Bovey Yang Company name Shenzhen STS Test Services Co., Ltd. Addresss 1/F., Building B, Zhuoke Science Park, No.190, Chongqing Road, Fuyong Street, Bao’an District, Shenzhen, Guangdong,China City Shenzhen Country China to act on our behalf on all matters concerning the application and documents submitted to Micom Labs for product certification below Product Description TWS BLUETOOTH EARBUDS Type or Model(s) COWIN Apex Pro Tradename or Brand(s) TWS BLUETOOTH EARBUDS Attestation: City: Date: Name: (this must be a person) Function: Signature: (or official company stamp) China 2020/12/30 Huang ping hua Manager

Shenzhen MeiDong Acoustics Co., LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2020/12/30 Subject; Request for Confidentiality FCC ID: 2AB5T-APEXPRO 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 Parts List Operational Description Tune-up Procedure In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. 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: Huang ping hua Title: Manager

Page 1 of 5 Report No.: STS2011127 APPENDIX-PHOTOGRAPHS OF EUT CONSTRUCTIONAL DETAILS Model: Apex Pro Photo 1 Photo 2 Page 2 of 5 Report No.: STS2011127 Photo 3 Photo 4 Page 3 of 5 Report No.: STS2011127 Photo 5 Photo 6 Page 4 of 5 Report No.: STS2011127 Photo 7 Photo 8 Page 5 of 5 Report No.: STS2011127 Photo 9

Label FCC ID shows on the front cover of the User Manual

Page 1 of 3 Report No.: STS2011127 APPENDIX-PHOTOGRAPHS OF EUT CONSTRUCTIONAL DETAILS Model: Apex Pro Photo 1 Photo 2 BT Antenna BT Antenna Page 2 of 3 Report No.: STS2011127 Photo 3 Photo 4 Page 3 of 3 Report No.: STS2011127 Photo 5 Photo 6

FCC ID : 2AB5T-APEXPRO RF EXPOSURE EVALUATION METHOD SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR,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 result is rounded to one decimal place for comparison 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 is applied to determine SAR test exclusion. FCC ID : 2AB5T-APEXPRO Maximum measured transmitter power. Left： BT5.0+EDR The Worst Case Mode 2402-2480MHz Detector PEAK GFSK 3.5±1dBm π/4-DQPSK 3.5±1dBm 8DPSK 3.5±1dBm Remark: The worst case gain of the antenna is 3Bi. 3Bi logarithmic terms convert to numeric result is nearly 1.995 Mode Frequen cy (GHz) Maxinum Peak Conducted Output Power (dBm) Tune up Power (dBm) Tune up Power (mW) Result Limit GFSK 2.402 4.19 4.5 2.818 0.874 3 π/4- DQPSK 2.402 4.09 4.5 2.818 0.874 3 8DPSK 2.402 4.11 4.5 2.818 0.874 3 Right： BT5.0+EDR The Worst Case Mode 2402-2480MHz Detector PEAK GFSK 4±1dBm π/4-DQPSK 3.5±1dBm 8DPSK 3.5±1dBm Remark: The worst case gain of the antenna is 3Bi. 3Bi logarithmic terms convert to numeric result is nearly 1.995 Mode Frequen cy (GHz) Maxinum Peak Conducted Output Power (dBm) Tune up Power (dBm) Tune up Power (mW) Result Limit GFSK 2.402 4.55 5 3.162 0.980 3 π/4- DQPSK 2.402 4.12 4.5 2.818 0.874 3 8DPSK 2.402 4.26 4.5 2.818 0.874 3 Threshold at which no SAR required is 0.980 ≤ 3.0 for 1-g SAR, Separation distance is 5mm.

Any reproduction of this document must be done in full. No single part of this document may be reproduced without permission from STS, all test data presented in this report is only applicable to presented test sample. Shenzhen STS Test Services Co., Ltd. A 1/F, Building B, Zhuoke Science Park, No.190 Chongqing Road, HepingShequ, Fuyong Sub-District, Bao’an District, Shenzhen, Guang Dong, China TEL: +86-755 3688 6288 FAX: +86-755 3688 6277 E-mail:[email protected] RADIO TEST REPORT Report No.: STS2011127W03 Issued for Shenzhen MeiDong Acoustics Co., LTD Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China Product Name: TWS BLUETOOTH EARBUDS Brand Name: Cowin, Meidong, Mighty Rock Model Name: COWIN Apex Pro Series Model: N/A FCC ID: 2AB5T-APEXPRO Test Standard: FCC Part 15.247 S T L A B S Page 2 of 76 Report No.: STS2011127W03 TEST RESULT CERTIFICATION Applicant’s Name ................... : Shenzhen MeiDong Acoustics Co., LTD Address .................................. : Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China Manufacturer's Name ............. : Shenzhen MeiDong Acoustics Co., LTD Address .................................. : Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China Product Description Product Name ........................ : TWS BLUETOOTH EARBUDS Brand Name ......................... : Cowin, Meidong, Mighty Rock Model Name ........................... : COWIN Apex Pro Series Model .......................... : N/A Test Standards ....................... : FCC Part15.247 Test Procedure ....................... : ANSI C63.10-2013 This device described above has been tested by STS, the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of STS, this document may be altered or revised by STS, personal only, and shall be noted in the revision of the document. Date of Test ................................ : Date of receipt of test item .......... : 02 Dec. 2020 Date (s) of performance of tests . : 02 Dec. 2020 ~ 04 Jan. 2021 Date of Issue .............................. : 04 Jan. 2021 Test Result .................................. : Pass Testing Engineer : (Chris Chen) Technical Manager : (Sean she) Authorized Signatory : (Vita Li) Page 3 of 76 Report No.: STS2011127W03 Table of Contents Page 1. SUMMARY OF TEST RESULTS 6 1.1 TEST FACTORY 7 1.2 MEASUREMENT UNCERTAINTY 7 2. GENERAL INFORMATION 8 2.1 GENERAL DESCRIPTION OF THE EUT 8 2.2 DESCRIPTION OF THE TEST MODES 10 2.3 FREQUENCY HOPPING SYSTEM REQUIREMENTS 10 2.4 TABLE OF PARAMETERS OF TEST SOFTWARE SETTING 12 2.5 BLOCK DIAGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED 13 2.6 DESCRIPTION OF NECESSARY ACCESSORIES AND SUPPORT UNITS 14 2.7 EQUIPMENTS LIST 15 3. EMC EMISSION TEST 17 3.1 CONDUCTED EMISSION MEASUREMENT 17 3.2 RADIATED EMISSION MEASUREMENT 21 4. CONDUCTED SPURIOUS & BAND EDGE EMISSION 33 4.1 LIMIT 33 4.2 TEST PROCEDURE 33 4.3 TEST SETUP 34 4.4 EUT OPERATION CONDITIONS 34 4.5 TEST RESULTS 35 5. NUMBER OF HOPPING CHANNEL 50 5.1 LIMIT 50 5.2 TEST PROCEDURE 50 5.3 TEST SETUP 50 5.4 EUT OPERATION CONDITIONS 50 5.5 TEST RESULTS 51 6. AVERAGE TIME OF OCCUPANCY 52 6.1 LIMIT 52 6.2 TEST PROCEDURE 52 6.3 TEST SETUP 52 6.4 EUT OPERATION CONDITIONS 52 6.5 TEST RESULTS 53 7. HOPPING CHANNEL SEPARATION MEASUREMEN 59 Page 4 of 76 Report No.: STS2011127W03 Table of Contents Page 7.1 LIMIT 59 7.2 TEST PROCEDURE 59 7.3 TEST SETUP 59 7.4 EUT OPERATION CONDITIONS 59 7.5 TEST RESULTS 60 8. BANDWIDTH TEST 66 8.1 LIMIT 66 8.2 TEST PROCEDURE 66 8.3 TEST SETUP 66 8.4 EUT OPERATION CONDITIONS 66 8.5 TEST RESULTS 67 9. OUTPUT POWER TEST 73 9.1 LIMIT 73 9.2 TEST PROCEDURE 73 9.3 TEST SETUP 73 9.4 EUT OPERATION CONDITIONS 73 9.5 TEST RESULTS 74 10. ANTENNA REQUIREMENT 75 10.1 STANDARD REQUIREMENT 75 10.2 EUT ANTENNA 75 Page 5 of 76 Report No.: STS2011127W03 Revision History Rev. Issue Date Report NO. Effect Page Contents 00 04 Jan. 2021 STS2011127W03 ALL Initial Issue Page 6 of 76 Report No.: STS2011127W03 1. SUMMARY OF TEST RESULTS Test procedures according to the technical standards: KDB 558074 D01 15.247 Meas Guidance v05r02. FCC Part 15.247,Subpart C Standard Section Test Item Judgment Remark 15.207 Conducted Emission PASS -- 15.247(a)(1) Hopping Channel Separation PASS -- 15.247(a)(1)&(b)(1) Output Power PASS -- 15.209 Radiated Spurious Emission PASS -- 15.247(d) Conducted Spurious & Band Edge Emission PASS -- 15.247(a)(1)(iii) Number of Hopping Frequency PASS -- 15.247(a)(1)(iii) Dwell Time PASS -- 15.247(a)(1) Bandwidth PASS -- 15.205 Restricted bands of operation PASS -- Part 15.247(d)/part 15.209(a) Band Edge Emission PASS -- 15.203 Antenna Requirement PASS -- NOTE: (1) ‘N/A’ denotes test is not applicable in this Test Report. (2) All tests are according to ANSI C63.10-2013. Page 7 of 76 Report No.: STS2011127W03 1.1 TEST FACTORY SHENZHEN STS TEST SERVICES CO., LTD Add. : A 1/F, Building B, Zhuoke Science Park, No.190 Chongqing Road, HepingShequ, Fuyong Sub-District, Bao’an District, Shenzhen, Guang Dong, China FCC test Firm Registration Number: 625569 IC test Firm Registration Number: 12108A A2LA Certificate No.: 4338.01 1.2 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ±U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence of approximately 95 %. No. Item Uncertainty 1 RF output power, conducted ±0.68dB 2 Unwanted Emissions, conducted ±2.988dB 3 All emissions, radiated 30-1GHz ±4.39dB 4 All emissions, radiated 1G-6GHz ±5.10dB 5 All emissions, radiated>6G ±5.48dB 6 Conducted Emission (9KHz-150KHz) ±2.79dB 7 Conducted Emission (150KHz-30MHz) ±2.80dB Page 8 of 76 …

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Page 39 of 76 Report No.: STS2011127W03 For Hopping Band edge GFSK Page 40 of 76 Report No.: STS2011127W03 Temperature: 25°C Relative Humidity: 50% Test Mode: π/4-DQPSK(2Mbps)– 00/39/78 CH Test Voltage: DC 3.7V 00 CH 39 CH Page 41 of 76 Report No.: STS2011127W03 78 CH Page 42 of 76 Report No.: STS2011127W03 For Band edge(it's also the reference level for conducted spurious emission) 00 CH 39 CH Page 43 of 76 Report No.: STS2011127W03 78 CH Page 44 of 76 Report No.: STS2011127W03 For Hopping Band edge π/4-DQPSK Page 45 of 76 Report No.: STS2011127W03 Temperature: 25°C Relative Humidity: 50% Test Mode: 8DPSK(3Mbps) -00/39/78 CH Test Voltage: DC 3.7V 00 CH 39 CH Page 46 of 76 Report No.: STS2011127W03 78 CH Page 47 of 76 Report No.: STS2011127W03 For Band edge(it's also the reference level for conducted spurious emission) 00 CH 39 CH Page 48 of 76 Report No.: STS2011127W03 78 CH Page 49 of 76 Report No.: STS2011127W03 For Hopping Band edge 8DPSK Page 50 of 76 Report No.: STS2011127W03 5. NUMBER OF HOPPING CHANNEL 5.1 LIMIT FCC Part 15.247,Subpart C Section Test Item Limit FrequencyRange (MHz) Result 15.247 (a)(1)(iii) Number of Hopping Channel ≥15 2400-2483.5 PASS Spectrum Parameters Setting Attenuation Auto Span Frequency > Operating FrequencyRange RB 300KHz VB 300KHz Detector Peak Trace Max Hold Sweep Time Auto 5.2 TEST PROCEDURE a. The EUT was directly connected to the spectrum analyzer and antenna output port as show in the block diagram below. b. Spectrum Setting: RBW= 300KHz, VBW=300KHz, Sweep time = Auto. 5.3 TEST SETUP 5.4 EUT OPERATION CONDITIONS Please refer to section 3.1.4 of this report. Page 51 of 76 Report No.: STS2011127W03 5.5 TEST RESULTS Temperature: 25°C Relative Humidity: 60% Test Mode: Hopping Mode -GFSK Mode Test Voltage: DC 3.7V Number of Hopping Channel 79 Hopping channel Page 52 of 76 Report No.: STS2011127W03 6. AVERAGE TIME OF OCCUPANCY 6.1 LIMIT FCC Part 15.247,Subpart C Section Test Item Limit FrequencyRange (MHz) Result 15.247 (a)(1)(iii) Average Time of Occupancy 0.4sec 2400-2483.5 PASS 6.2 TEST PROCEDURE a. The transmitter output (antenna port) was connected to the spectrum analyzer. b. Set RBW =1MHz/VBW =3MHz. c. Use a video trigger with the trigger level set to enable triggering only on full pulses. d. Sweep Time is more than once pulse time. e. Set the center frequency on any frequency would be measure and set the frequency span to zero span. f. Measure the maximum time duration of one single pulse. g. Set the EUT for DH5, DH3 and DH1 packet transmitting. h. Measure the maximum time duration of one single pulse. i. DH5 Packet permit maximum 1600/ 79 / 6 = 3.37 hops per second in each channel (5 time slots RX, 1 time slot TX). So the number of pulses in the observation period of 31.6 seconds is 3.37 x 31.6 = 106.6. j. DH3 Packet permit maximum 1600 / 79 / 4 = 5.06 hops per second in each channel (3 time slots RX, 1 time slot TX). So the number of pulses in the observation period of 31.6 seconds is 5.06 x 31.6 = 160. k. DH1 Packet permit maximum 1600 / 79 / 2 = 10.12 hops per second in each channel (1 time slot RX, 1 time slot TX). So the number of pulses in the observation period of 31.6 seconds is 10.12 x 31.6 = 320. 6.3 TEST SETUP 6.4 EUT OPERATION CONDITIONS Please refer to section 3.1.4 of this report. Page 53 of 76 Report No.: STS2011127W03 6.5 TEST RESULTS Temperature: 25°C Relative Humidity: 50% Test Mode: GFSK(1Mbps)-DH1/DH3/DH5 Test Voltage: DC 3.7V Data Packet Channel pulse time(ms) Dwell Time(s) Limits(s) DH1 middle 0.406 0.130 0.4 DH3 middle 1.657 0.265 0.4 DH5 middle 2.900 0.309 0.4 Page 54 of 76 Report No.: STS2011127W03 CH39-DH1 CH39-DH3 CH39-DH5 Page 55 of 76 Report No.: STS2011127W03 Temperature: 25°C Relative Humidity: 50% Test Mode: π/4-DQPSK(2Mbps)– 2DH1/2DH3/2DH5 Test Voltage: DC 3.7V Data Packet Channel pulse time(ms) Dwell Time(s) Limits(s) 2DH1 middle 0.407 0.130 0.4 2DH3 middle 1.658 0.265 0.4 2DH5 middle 2.910 0.310 0.4 Page 56 of 76 Report No.: STS2011127W03 CH39-2DH1 CH39-2DH3 CH39-2DH5 Page 57 of 76 Report No.: STS2011127W03 Temperature: 25°C Relative Humidity: 50% Test Mode: 8DPSK(3Mbps)– 3DH1/3DH3/3DH5 Test Voltage: DC 3.7V Data Packet Channel pulse time(ms) Dwell Time(s) Limits(s) 3DH1 middle 0.406 0.130 0.4 3DH3 middle 1.658 0.265 0.4 3DH5 middle 2.908 0.310 0.4 Page 58 of 76 Report No.: STS2011127W03 CH39-3DH1 CH39-3DH3 CH39-3DH5 Page 59 of 76 Report No.: STS2011127W03 7. HOPPING CHANNEL SEPARATION MEASUREMEN 7.1 LIMIT Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hopping channel, whichever is greater. Alternatively, frequency hopping systems operating in the 2400-2483.5 MHz band may have hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the hopping channel, whichever is greater, provided the systems operate with an output power no greater than 125 mW. Spectrum Parameter Setting Attenuation Auto Span Frequency > 20 dB Bandwidth or Channel Separation RB 30 kHz (20dB Bandwidth) / 30 kHz (Channel Separation) VB 100 kHz (20dB Bandwidth) / 100 kHz (Channel Separation) Detector Peak Trace Max Hold Sweep Time Auto 7.2 TEST PROCEDURE a. The transmitter output (antenna port) was connected to the spectrum analyser in peak hold mode. b. The resolution bandwidth of 30 kHz and the video bandwidth of 100 kHz were utilised for 20 dB bandwidth measurement. c. The resolution bandwidth of 30 kHz and the video bandwidth of 100 kHz were utilised for channel separation measurement. 7.3 TEST SETUP 7.4 EUT OPERATION CONDITIONS The EUT was programmed to be in continuously transmitting mode. Page 60 of 76 Report No.: STS2011127W03 7.5 TEST RESULTS Temperature: 25°C Relative Humidity: 50% Test Mode: CH00 / CH39 / CH78 (GFSK(1Mbps) Mode) Test Voltage: DC 3.7V Frequency Mark1 Frequency （MHz） Mark2 Frequency （MHz） Ch. Separation (MHz) Limit (MHz) Result 2402 MHz 2401.999 2402.998 0.999 0.700 Complies 2441 MHz…

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Any reproduction of this document must be done in full. No single part of this document may be reproduced without permission from STS, all test data presented in this report is only applicable to presented test sample. Shenzhen STS Test Services Co., Ltd. A 1/F, Building B, Zhuoke Science Park, No.190 Chongqing Road, HepingShequ, Fuyong Sub-District, Bao’an District, Shenzhen, Guang Dong, China TEL: +86-755 3688 6288 FAX: +86-755 3688 6277 E-mail:[email protected] RADIO TEST REPORT Report No.: STS2011127W04 Issued for Shenzhen MeiDong Acoustics Co., LTD Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China Product Name: TWS BLUETOOTH EARBUDS Brand Name: Cowin, Meidong, Mighty Rock Model Name: COWIN Apex Pro Series Model: N/A FCC ID: 2AB5T-APEXPRO Test Standard: FCC Part 15.247 S T L A B S Page 2 of 76 Report No.: STS2011127W04 TEST RESULT CERTIFICATION Applicant’s Name ................... : Shenzhen MeiDong Acoustics Co., LTD Address .................................. : Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China Manufacturer's Name ............. : Shenzhen MeiDong Acoustics Co., LTD Address .................................. : Cell B, 3th Floor, Tower B, Hongzhuyongqi Technology Park, Lezhujiao, Xixiang, Baoan, Shenzhen, Guangdong, China Product Description Product Name ........................ : TWS BLUETOOTH EARBUDS Brand Name ......................... : Cowin, Meidong, Mighty Rock Model Name ........................... : COWIN Apex Pro Series Model .......................... : N/A Test Standards ....................... : FCC Part15.247 Test Procedure ....................... : ANSI C63.10-2013 This device described above has been tested by STS, the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of STS, this document may be altered or revised by STS, personal only, and shall be noted in the revision of the document. Date of Test ................................ : Date of receipt of test item .......... : 02 Dec. 2020 Date (s) of performance of tests . : 02 Dec. 2020 ~ 17 Dec. 2020 Date of Issue .............................. : 17 Dec. 2020 Test Result .................................. : Pass Testing Engineer : (Chris Chen) Technical Manager : (Sean she) Authorized Signatory : (Vita Li) Page 3 of 76 Report No.: STS2011127W04 Table of Contents Page 1. SUMMARY OF TEST RESULTS 6 1.1 TEST FACTORY 7 1.2 MEASUREMENT UNCERTAINTY 7 2. GENERAL INFORMATION 8 2.1 GENERAL DESCRIPTION OF THE EUT 8 2.2 DESCRIPTION OF THE TEST MODES 10 2.3 FREQUENCY HOPPING SYSTEM REQUIREMENTS 10 2.4 TABLE OF PARAMETERS OF TEST SOFTWARE SETTING 12 2.5 BLOCK DIAGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED 13 2.6 DESCRIPTION OF NECESSARY ACCESSORIES AND SUPPORT UNITS 14 2.7 EQUIPMENTS LIST 15 3. EMC EMISSION TEST 17 3.1 CONDUCTED EMISSION MEASUREMENT 17 3.2 RADIATED EMISSION MEASUREMENT 21 4. CONDUCTED SPURIOUS & BAND EDGE EMISSION 33 4.1 LIMIT 33 4.2 TEST PROCEDURE 33 4.3 TEST SETUP 34 4.4 EUT OPERATION CONDITIONS 34 4.5 TEST RESULTS 35 5. NUMBER OF HOPPING CHANNEL 50 5.1 LIMIT 50 5.2 TEST PROCEDURE 50 5.3 TEST SETUP 50 5.4 EUT OPERATION CONDITIONS 50 5.5 TEST RESULTS 51 6. AVERAGE TIME OF OCCUPANCY 52 6.1 LIMIT 52 6.2 TEST PROCEDURE 52 6.3 TEST SETUP 52 6.4 EUT OPERATION CONDITIONS 52 6.5 TEST RESULTS 53 7. HOPPING CHANNEL SEPARATION MEASUREMEN 59 Page 4 of 76 Report No.: STS2011127W04 Table of Contents Page 7.1 LIMIT 59 7.2 TEST PROCEDURE 59 7.3 TEST SETUP 59 7.4 EUT OPERATION CONDITIONS 59 7.5 TEST RESULTS 60 8. BANDWIDTH TEST 66 8.1 LIMIT 66 8.2 TEST PROCEDURE 66 8.3 TEST SETUP 66 8.4 EUT OPERATION CONDITIONS 66 8.5 TEST RESULTS 67 9. OUTPUT POWER TEST 73 9.1 LIMIT 73 9.2 TEST PROCEDURE 73 9.3 TEST SETUP 73 9.4 EUT OPERATION CONDITIONS 73 9.5 TEST RESULTS 74 10. ANTENNA REQUIREMENT 75 10.1 STANDARD REQUIREMENT 75 10.2 EUT ANTENNA 75 Page 5 of 76 Report No.: STS2011127W04 Revision History Rev. Issue Date Report NO. Effect Page Contents 00 17 Dec. 2020 STS2011127W04 ALL Initial Issue Page 6 of 76 Report No.: STS2011127W04 1. SUMMARY OF TEST RESULTS Test procedures according to the technical standards: KDB 558074 D01 15.247 Meas Guidance v05r02. FCC Part 15.247,Subpart C Standard Section Test Item Judgment Remark 15.207 Conducted Emission PASS -- 15.247(a)(1) Hopping Channel Separation PASS -- 15.247(a)(1)&(b)(1) Output Power PASS -- 15.209 Radiated Spurious Emission PASS -- 15.247(d) Conducted Spurious & Band Edge Emission PASS -- 15.247(a)(1)(iii) Number of Hopping Frequency PASS -- 15.247(a)(1)(iii) Dwell Time PASS -- 15.247(a)(1) Bandwidth PASS -- 15.205 Restricted bands of operation PASS -- Part 15.247(d)/part 15.209(a) Band Edge Emission PASS -- 15.203 Antenna Requirement PASS -- NOTE: (1) ‘N/A’ denotes test is not applicable in this Test Report. (2) All tests are according to ANSI C63.10-2013. Page 7 of 76 Report No.: STS2011127W04 1.1 TEST FACTORY SHENZHEN STS TEST SERVICES CO., LTD Add. : A 1/F, Building B, Zhuoke Science Park, No.190 Chongqing Road, HepingShequ, Fuyong Sub-District, Bao’an District, Shenzhen, Guang Dong, China FCC test Firm Registration Number: 625569 IC test Firm Registration Number: 12108A A2LA Certificate No.: 4338.01 1.2 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ±U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence of approximately 95 %. No. Item Uncertainty 1 RF output power, conducted ±0.68dB 2 Unwanted Emi…

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