2AT9X-SC-1097BTRadio

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Shenzhen M&lak Industry Co., Ltd 2021.04.09 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR Trademark: N/A MODEL : SC-1097BT, MLK-6079BT FCC ID: 2AT9X-SC-1097BT 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 : John Feng/Manager Contact information / address: 5 Floor, JinShan Industrial Zone, No.375, GuangShen, China

Shenzhen M&lak Industry Co., Ltd 2021.04.09 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION 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 : John Feng Contact information / address: 5 Floor, JinShan Industrial Zone, No.375, GuangShen, China

Shenzhen M&lak Industry Co., Ltd Model Difference 2021-04-09 EUT NAME: Radio FCC ID: 2AT9X-SC-1097BT MODEL : SC-1097BT,MLK-6079BT All the model are the same circuit and RF module, only for model name and color. Regards Sincerely Client’s signature Client’s name / title : John Feng / Manager Contact information / address: 5 Floor, JinShan Industrial Zone, No.375, GuangShen, China

External Photos

Model:SC-1097BT FCC ID: 2AT9X-SC-1097BT Label Location

Internal Photos Antenna

RF EXPOSURE EVALUATION METHOD FCC ID: 2AT9X-SC-1097BT 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. BT Modulation Test Channel Output Power (dBm) Limit (dBm) GFSK Low -3.142 21 GFSK Middle -2.287 21 GFSK High -1.631 21 Pi/4 DQPSK Low -2.236 21 Pi/4 DQPSK Middle -1.397 21 Pi/4 DQPSK High -0.743 21 max possible output power (PK,conducted)：0±1dBm 0dBi logarithmic terms convert to numeric result is nearly 1. 1dBm=1.26mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=1.26/5*√2.402=0.40≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. 2440MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.26/5*√2.440=0.40≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=1.26/5*√2.48=0.40≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. Conclusion: No SAR is required.

No.：BCTC/RF-EMC-005 Page 1 of 62 Edition：A.3 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2103666599E Applicant: Shenzhen M&lak Industry Co., Ltd Product Name: Radio Model/Type Ref.: SC-1097BT Tested Date: 2021-03-24 to 2021-03-29 Issued Date: 2021-03-30 Report No.: BCTC2103666599E No.：BCTC/RF-EMC-005 Page 2 of 62 Edition：A.3 FCC ID: 2AT9X-SC-1097BT 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: Radio Trademark: SUPERSONIC Model/Type Ref.: SC-1097BT MLK-6079BT Prepared For: Shenzhen M&lak Industry Co., Ltd Address: 5 Floor, JinShan Industrial Zone, No.375, GuangShen, China Manufacturer: Shenzhen M&lak Industry Co., Ltd Address: 5 Floor, JinShan Industrial Zone, No.375, GuangShen, China Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Tangwei, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2021-03-24 Sample tested Date: 2021-03-24 to 2021-03-29 Issue Date: 2021-03-30 Report No.: BCTC2103666599E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Sam zeng/Project Handler Zero Zhou/Reviewer Report No.: BCTC2103666599E No.：BCTC/RF-EMC-005 Page 3 of 62 Edition：A.3 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 ............................................... 14 6.5 Test Result ........................................................... 15 7. RADIATED EMISSIONS .............................................. 17 7.1 Block Diagram Of Test Setup ............................................ 17 7.2 Limit ................................................................. 18 7.3 Test procedure ........................................................ 19 7.4 EUT operating Conditions ............................................... 20 7.5 Test Result ........................................................... 21 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. CONDUCTED EMISSION ............................................. 28 9.1 Block Diagram Of Test Setup ............................................ 28 9.2 Limit ................................................................. 28 9.3 Test procedure ........................................................ 28 9.4 Test Result ........................................................... 29 10. 20 DB BANDWIDTH .................................................. 35 10.1 Block Diagram Of Test Setup .......................................... 35 Report No.: BCTC2103666599E No.：BCTC/RF-EMC-005 Page 4 of 62 Edition：A.3 10.2 Limit ................................................................ 35 10.3 Test procedure ....................................................... 35 10.4 Test Result .......................................................... 36 11. MAXIMUM PEAK OUTPUT POWER .................................... 40 11.1 Block Diagram Of Test Setup .......................................... 40 11.2 Limit ................................................................ 40 11.3 Test procedure ....................................................... 40 11.4 Test Result .......................................................... 41 12. HOPPING CHANNEL SEPARATION ................................... 45 12.1 Block Diagram Of Test Setup .......................................... 45 12.2 Limit ................................................................ 45 12.3 Test procedure ....................................................... 45 12.4 Test Result .......................................................... 46 13. NUMBER OF HOPPING FREQUENCY .................................. 50 13.1 Block Diagram Of Test Setup .......................................... 50 13.2 Limit ................................................................ 50 13.3 Test procedure .....................................…

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Report No.: BCTC2103666599E Test Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 1 of 2 1. EUT TEST SETUP PHOTOGRAPHS Spurious emissions Report No.: BCTC2103666599E Test Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 2 of 2 Conducted emissions ※※※※※ END OF REPORT ※※※※※