YILMH-807True Wireless Bluetooth Earbuds

SHENZHEN CHENGYAN SCIENCE & TECHNOLOGY CO., LTD Agent Authorization Company: SHENZHEN CHENGYAN SCIENCE & TECHNOLOGY CO., LTD Address: Room 1808, Shenhua Commercial Building,Jiabin Rd.,Luohu district, Shenzhen, China Product Name: True Wireless Bluetooth Earbuds Model Number(s): MH-807 Product Description: True Wireless 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: 2020-11-11 Name: Charlie Wang Company: SHENZHEN CHENGYAN SCIENCE & TECHNOLOGY CO., LTD

SHENZHEN CHENGYAN SCIENCE & TECHNOLOGY CO., LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2020-09-25 Subject; Request for Confidentiality FCC ID: YILMH-807 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 SHENZHEN CHENGYAN SCIENCE & TECHNOLOGY CO., LTD Contact person: Charlie Wang

External Photos WHOLE VIEW OF EUT-1 WHOLE VIEW OF EUT-2 TOP VIEW OF EUT BOTTOM VIEW OF EUT FRONT VIEW OF EUT BACK VIEW OF EUT LEFT VIEW OF EUT RIGHT VIEW OF EUT Left VIEW OF EUT(PORT) Right VIEW OF EUT(PORT)

FCC ID Label Location The product does not have enough space to place the label, and FCC ID label is reflected in the user manual and package, as below:

Internal Photos Left OPEN VIEW OF EUT VIEW OF BATTERY INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 INTERNAL VIEW OF EUT-3 BT Antenna INTERNAL VIEW OF EUT-4 INTERNAL VIEW OF EUT-5 INTERNAL VIEW OF EUT-6 Right OPEN VIEW OF EUT VIEW OF BATTERY INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 INTERNAL VIEW OF EUT-3 BT Antenna INTERNAL VIEW OF EUT-4 INTERNAL VIEW OF EUT-5 INTERNAL VIEW OF EUT-6

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description True Wireless Bluetooth Earbuds Model Name MH-807 FCC ID YILMH-807 2. EVALUATION METHOD According to 447498 D01 General RF Exposure Guidance v05 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 3. CALCULATION BR/EDR: P t = 0.462dBm=1.112mW The value of the Maximum output power P t is referred to the test report of the CFR47 §15.247. The result for RF exposure evaluation SAR=(1.112mW /5mm) .[√2.480GHz)]=0.35<3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR. 4. CONCLUSION The SAR evaluation is not required.

Page 1 of 79 FCC Test Report Report No.: AGC02011200901FE03 FCC ID : YILMH-807 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : True Wireless Bluetooth Earbuds BRAND NAME : Diso MODEL NAME : MH-807 APPLICANT : Shenzhen Chengyan Science and Technology Co., Ltd DATE OF ISSUE : Sep. 25,2020 STANDARD(S) : FCC Part 15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC02011200901FE03 Page 2 of 79 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / Sep. 25,2020 Valid Initial Release Report No.: AGC02011200901FE03 Page 3 of 79 TABLE OF CONTENTS 1. VERIFICATION OF CONFORMITY ............................................................................................................... 5 2. GENERAL INFORMATION ............................................................................................................................ 6 2.1. PRODUCT DESCRIPTION ..................................................................................................................... 6 2.2. TABLE OF CARRIER FREQUENCYS ..................................................................................................... 6 2.3. RECEIVER INPUT BANDWIDTH ............................................................................................................ 7 2.4. EXAMPLE OF A HOPPING SEQUENCY IN DATA MODE ....................................................................... 7 2.5. EQUALLY AVERAGE USE OF FREQUENCIES AND BEHAVIOUR ........................................................ 7 2.6. RELATED SUBMITTAL(S) / GRANT (S) .................................................................................................. 8 2.7. TEST METHODOLOGY .......................................................................................................................... 8 2.8. SPECIAL ACCESSORIES ....................................................................................................................... 8 2.9. EQUIPMENT MODIFICATIONS .............................................................................................................. 8 2.10. ANTENNA REQUIREMENT .................................................................................................................. 8 3. MEASUREMENT UNCERTAINTY ................................................................................................................. 9 4. DESCRIPTION OF TEST MODES ............................................................................................................... 10 5. SYSTEM TEST CONFIGURATION ............................................................................................................. 11 5.1. CONFIGURATION OF EUT SYSTEM .................................................................................................... 11 5.2. EQUIPMENT USED IN TESTED SYSTEM ............................................................................................. 11 5.3. SUMMARY OF TEST RESULTS ............................................................................................................. 11 6. TEST FACILITY ........................................................................................................................................... 12 7. PEAK OUTPUT POWER ............................................................................................................................. 13 7.1. MEASUREMENT PROCEDURE ........................................................................................................... 13 7.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 13 7.3. LIMITS AND MEASUREMENT RESULT ............................................................................................... 14 8. 20DB BANDWIDTH ..................................................................................................................................... 20 8.1. MEASUREMENT PROCEDURE ........................................................................................................... 20 8.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 20 8.3. LIMITS AND MEASUREMENT RESULTS ............................................................................................. 21 9. CONDUCTED SPURIOUS EMISSION ........................................................................................................ 27 9.1. MEASUREMENT PROCEDURE ........................................................................................................... 27 Report No.: AGC02011200901FE03 Page 4 of 79 9.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 27 9.3. MEASUREMENT EQUIPMENT USED .................................................................................................. 27 9.4. LIMITS AND MEASUREMENT RESULT ............................................................................................... 27 10. RADIATED EMISSION ............................................................................................................................... 40 10.1. MEASUREMENT PROCEDURE ......................................................................................................... 40 10.2. TEST SETUP ....................................................................................................................................... 42 10.3. LIMITS AND MEASUREMENT RESULT ............................................................................................. 43 10.4. TEST RESULT ..................................................................................................................................... 43 11. NUMBER OF HOPPING FREQUENCY ..................................................................................................... 53 11.1. MEASUREMENT PRO…

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Report No.: AGC02011200901FE03 Page 50 of 79 EUT True Wireless Bluetooth Earbuds Model Name MH-807 Temperature 25°C Relative Humidity 55.4% Pressure 960hPa Test Voltage Normal Voltage Test Mode Mode 1 Antenna Vertical PK AV RESULT: PASS Report No.: AGC02011200901FE03 Page 51 of 79 EUT True Wireless Bluetooth Earbuds Model Name MH-807 Temperature 25°C Relative Humidity 55.4% Pressure 960hPa Test Voltage Normal Voltage Test Mode Mode 3 Antenna Horizontal PK AV RESULT: PASS Report No.: AGC02011200901FE03 Page 52 of 79 EUT True Wireless Bluetooth Earbuds Model Name MH-807 Temperature 25°C Relative Humidity 55.4% Pressure 960hPa Test Voltage Normal Voltage Test Mode Mode 3 Antenna Vertical PK AV RESULT: PASS Note: The factor had been edited in the “Input Correction” of the Spectrum Analyzer. The GFSK modulation is the worst case and recorded in the report. Report No.: AGC02011200901FE03 Page 53 of 79 11. NUMBER OF HOPPING FREQUENCY 11.1. MEASUREMENT PROCEDURE The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings: 1. Span: The frequency band of operation. Depending on the number of channels the device supports, it may be necessary to divide the frequency range of operation across multiple spans, to allow the individual channels to be clearly seen. 2. RBW: To identify clearly the individual channels, set the RBW to less than 30% of the channel spacing or the 20 dB bandwidth, whichever is smaller. 3. VBW ≥ RBW. Sweep: Auto. Detector function: Peak. Trace: Max hold. 4. Allow the trace to stabilize. 11.2. TEST SETUP (BLOCK DIAGRAM OF CONFIGURATION) Same as described in section 8.2 11.3. MEASUREMENT EQUIPMENT USED The same as described in section 6 11.4. LIMITS AND MEASUREMENT RESULT TOTAL NO. OF HOPPING CHANNEL LIMIT (NO. OF CH) MEASUREMENT (NO. OF CH) RESULT >=15 79 PASS TEST PLOT FOR NO. OF TOTAL CHANNELS Note: The GFSK modulation is the worst case and recorded in the report. Report No.: AGC02011200901FE03 Page 54 of 79 12. TIME OF OCCUPANCY (DWELL TIME) 12.1. MEASUREMENT PROCEDURE The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings: 1. Span: Zero span, centered on a hopping channel. 2. RBW shall be≤channel spacing and where possible RBW should be set >> 1 / T, where T is the expected dwell time per channel. 3. Sweep: As necessary to capture the entire dwell time per hopping channel; where possible use a video trigger and trigger delay so that the transmitted signal starts a little to the right of the start of the plot. The trigger level might need slight adjustment to prevent triggering when the system hops on an adjacent channel; a second plot might be needed with a longer sweep time to show two successive hops on a channel. 4. Detector function: Peak. Trace: Max hold. 5. Use the marker-delta function to determine the transmit time per hop. 6. Repeat the measurement using a longer sweep time to determine the number of hops over the period specified in the requirements. The sweep time shall be equal to, or less than, the period specified in the requirements. Determine the number of hops over the sweep time and calculate the total number of hops in the period specified in the requirements, using the following equation: (Number of hops in the period specified in the requirements) = (number of hops on spectrum analyzer) × (period specified in the requirements / analyzer sweep time) 7. The average time of occupancy is calculated from the transmit time per hop multiplied by the number of hops in the period specified in the requirements. 12.2. TEST SETUP (BLOCK DIAGRAM OF CONFIGURATION) Same as described in section 8.2 12.3. MEASUREMENT EQUIPMENT USED The same as described in section 6 12.4. LIMITS AND MEASUREMENT RESULT Channel Time of Pulse for DH5 (ms) Number of hops in the period specified in the requirements Sweep Time (ms) Limit (ms) Low 2.886 27*4 311.688 400 Middle 2.886 31*4 357.864 400 High 2.886 27*4 311.688 400 Note: The GFSK modulation is the worst case and recorded in the report. Report No.: AGC02011200901FE03 Page 55 of 79 TEST PLOT OF LOW CHANNEL Report No.: AGC02011200901FE03 Page 56 of 79 TEST PLOT OF MIDDLE CHANNEL Report No.: AGC02011200901FE03 Page 57 of 79 TEST PLOT OF HIGH CHANNEL Report No.: AGC02011200901FE03 Page 58 of 79 13. FREQUENCY SEPARATION 13.1. MEASUREMENT PROCEDURE The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings: 1. Span: Wide enough to capture the peaks of two adjacent channels. 2. RBW: Start with the RBW set to approximately 30% of the channel spacing; adjust as necessary to best identify the center of each individual channel. 3. Video (or average) bandwidth (VBW) ≥ RBW. 4. Sweep: Auto. e) Detector function: Peak. f) Trace: Max hold. g) Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. 13.2. TEST SETUP (BLOCK DIAGRAM OF CONFIGURATION) Same as described in section 6.2 13.3. MEASUREMENT EQUIPMENT USED The same as described in section 6.3 13.4. LIMITS AND MEASUREMENT RESULT CHANNEL CHANNEL SEPARATION LIMIT RESULT MHz Pass CH38-CH39 1.001 2/3 20 dB BW TEST PLOT FOR FREQUENCY SEPARATION Note: The GFSK modulation is the worst case and recorded in the report. Report No.: AGC02011200901FE03 Page 59 of 79 APPENDIX A: PHOTOGRAPHS OF TEST SETUP RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz Report No.: AGC02011200901FE03 Page 60 of 79 CONDUCTED TEST SETUP Report No.: AGC02011200901FE03 Page 61 of 79 APPENDIX B: PHOTOGRAPHS OF EUT WHOLE VIEW OF EUT-1 WHOLE VIEW OF EUT-2 Report No.: AGC02011200901FE03 Page 62 of 79 TOP VIEW OF EUT BOTTOM VIEW OF EUT Report No.: AGC02011200901FE03 Page 63 of 79 FRONT VIEW OF EUT BACK VIEW OF EUT Report No.: AGC02011200901FE03 Page 64 of 79 LEFT VIEW OF EUT RIGHT VIEW OF EUT Report No.: AGC02011200901FE03 Page 65 of 79 Left VIEW OF EUT(PORT) OPEN VIEW OF EUT Report No.: AGC02011200901FE03 Page 66 of 79 VIEW…

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Report No.: AGC02011200901FE03 Page 70 of 79 OPEN VIEW OF EUT VIEW OF BATTERY Report No.: AGC02011200901FE03 Page 71 of 79 INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 Report No.: AGC02011200901FE03 Page 72 of 79 INTERNAL VIEW OF EUT-3 INTERNAL VIEW OF EUT-4 BT Antenna Report No.: AGC02011200901FE03 Page 73 of 79 INTERNAL VIEW OF EUT-5 INTERNAL VIEW OF EUT-6 Report No.: AGC02011200901FE03 Page 74 of 79 Charging Dock TOP VIEW OF EUT BOTTOM VIEW OF EUT Report No.: AGC02011200901FE03 Page 75 of 79 FRONT VIEW OF EUT BACK VIEW OF EUT Report No.: AGC02011200901FE03 Page 76 of 79 LEFT VIEW OF EUT RIGHT VIEW OF EUT Report No.: AGC02011200901FE03 Page 77 of 79 VIEW OF EUT(port)-1 VIEW OF EUT(port)-2 Report No.: AGC02011200901FE03 Page 78 of 79 OPEN VIEW OF EUT VIEW OF BATTERY Report No.: AGC02011200901FE03 Page 79 of 79 INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 ----END OF REPORT---- Conditions of Issuance of Test Reports 1. All samples and goods are accepted by the Attestation of Global Compliance (Shenzhen) Co., Ltd (the “Company”) solely for testing and reporting in accordance with the following terms and conditions. The company provides its services on the basis that such terms and conditions constitute express agreement between the company and any person, firm or company requesting its services (the “Clients”). 2. Any report issued by Company as a result of this application for testing services (the “Report”) shall be issued in confidence to the Clients and the Report will be strictly treated as such by the Company. It may not be reproduced either in its entirety or in part and it may not be used for advertising or other unauthorized purposes without the written consent of the Company. The Clients to whom the Report is issued may, however, show or send it, or a certified copy thereof prepared by the Company to its customer, supplier or other persons directly concerned. The Company will not, without the consent of the Clients, enter into any discussion or correspondence with any third party concerning the contents of the Report, unless required by the relevant governmental authorities, laws or court orders. 3.The Company shall not be called or be liable to be called to give evidence or testimony on the Report in a court of law without its prior written consent, unless required by the relevant governmental authorities, laws or court orders. 4. The non-CMA report issued by AGC is only permitted to be used by the client as internal reference use and shall not be used for public demonstration purpose. 5. In the event of the improper use of the report as determined by the Company, the Company reserves the right to withdraw it, and to adopt any other additional remedies which may be appropriate. 6. Samples submitted for testing are accepted on the understanding that the Report issued cannot form the basis of, or be the instrument for, any legal action against the Company. 7. The Company will not be liable for or accept responsibility for any loss or damage however arising from the use of information contained in any of its Reports or in any communication whatsoever about its said tests or investigations. 8.Clients wishing to use the Report in court proceedings or arbitration shall inform the Company to that effect prior to submitting the sample for testing. 9. The Company is not responsible for recalling the electronic version of the original report when any revision is made to them. The Client assumes the responsibility to providing the revised version to any interested party who uses them. 10. Subject to the variable length of retention time for test data and report stored hereinto as otherwise specifically required by individual accreditation authorities, the Company will only keep the supporting test data and information of the test report for a period of six years. The data and information will be disposed of after the aforementioned retention period has elapsed. Under no circumstances shall we provide any data and information which has been disposed of after retention period. Under no circumstances shall we be liable for damage of any kind, including (but not limited to) compensatory damages, lost profits, lost data, or any form of special, incidental, indirect, consequential or punitive damages of any kind, whether based on breach of contract of warranty, tort (including negligence), product liability or otherwise, even if we are informed in advance of the possibility of such damages.

Test Setup Photos RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz CONDUCTED TEST SETUP