2A6SW-NT22AWireless Headphones

SMARTSOUND TECHNOLOGY CO., LTD May 13, 2022 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject: Explanation of differences between product types FCC ID : 2A6SW-NT22A Model Number: D17, NT22A To Whom It May Concern: We, The SMARTSOUND TECHNOLOGY CO., LTD hereby declare that the models are identical except the model name. Except for the different above, no other modification is performed. Sincerely, Signature: SMARTSOUND TECHNOLOGY CO., LTD Contact person: Yulan Wen

SMARTSOUND TECHNOLOGY CO., LTD Agent Authorization Company: SMARTSOUND TECHNOLOGY CO., LTD Address: Room 701, 28 Xinhong Road, Lincun, Tangxia Town, Dongguan City, Guangdong, China Product Name: Wireless Headphones Model Number(s): D17, NT22A Product Description: Wireless Headphones 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: 2022-05-19 Name: Yulan Wen Company: SMARTSOUND TECHNOLOGY CO., LTD

SMARTSOUND TECHNOLOGY CO., LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2022-05-10 Subject; Request for Confidentiality FCC ID: 2A6SW-NT22A 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 SMARTSOUND TECHNOLOGY CO., LTD Contact person: Yulan Wen

Report No.: AGC01475211103AP02 Page 1 of 4 EXTERNAL PHOTOS ALL VIEW OF EUT (FIGURE 1) TOP VIEW OF EUT Report No.: AGC01475211103AP02 Page 2 of 4 BOTTOM VIEW OF EUT FRONT VIEW OF EUT Report No.: AGC01475211103AP02 Page 3 of 4 BACK VIEW OF EUT LEFT VIEW OF EUT Report No.: AGC01475211103AP02 Page 4 of 4 RIGHT VIEW OF EUT ****************************************End of Report****************************************

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:

Report No.: AGC01475211103AP02 Page 1 of 7 INTERNAL PHOTOS Left PORT VIEW OF EUT (FIGURE 1) OPEN VIEW OF EUT (FIGURE 1) BT Antenna Report No.: AGC01475211103AP02 Page 2 of 7 VIEW OF BATTERY (FIGURE 1) INTERNAL VIEW OF EUT (FIGURE 1) Report No.: AGC01475211103AP02 Page 3 of 7 INTERNAL VIEW OF EUT (FIGURE 2) INTERNAL VIEW OF EUT (FIGURE 3) Report No.: AGC01475211103AP02 Page 4 of 7 Right PORT VIEW OF EUT (FIGURE 1) OPEN VIEW OF EUT (FIGURE 1) Report No.: AGC01475211103AP02 Page 5 of 7 VIEW OF BATTERY (FIGURE 1) ANTENNA CLOSE-UP PHOTO-1 BT Antenna Report No.: AGC01475211103AP02 Page 6 of 7 INTERNAL VIEW OF EUT (FIGURE 1) INTERNAL VIEW OF EUT (FIGURE 2) Report No.: AGC01475211103AP02 Page 7 of 7 INTERNAL VIEW OF EUT (FIGURE 3) ****************************************End of Report****************************************

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description Wireless Headphones Test Model D17 Series Model NT22A FCC ID 2A6SW-NT22A 2. EVALUATION METHOD According to 447498 D01 General RF Exposure Guidance v06 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 P t =0.799dBm=1.20mW 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=(1.20mW /5mm) .[√2.402(GHz)]= 0.37<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 72 FCC Test Report Report No.: AGC01475211103FE03 FCC ID : 2A6SW-NT22A APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Wireless Headphones BRAND NAME : N/A MODEL NAME : D17, NT22A APPLICANT : SMARTSOUND TECHNOLOGY CO., LTD DATE OF ISSUE : Jun. 02, 2022 STANDARD(S) : FCC Part 15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC01475211103FE03 Page 2 of 72 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / Jun. 02, 2022 Valid Initial Release Report No.: AGC01475211103FE03 Page 3 of 72 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 ........................................................................................................................................ 24 8.1. MEASUREMENT PROCEDURE ............................................................................................................. 24 8.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................... 24 8.3. LIMITS AND MEASUREMENT RESULTS ............................................................................................... 25 9. CONDUCTED SPURIOUS EMISSION........................................................................................................... 30 9.1. MEASUREMENT PROCEDURE ............................................................................................................. 30 Report No.: AGC01475211103FE03 Page 4 of 72 9.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................... 30 9.3. MEASUREMENT EQUIPMENT USED .................................................................................................... 30 9.4. LIMITS AND MEASUREMENT RESULT .................................................................................................. 30 10. RADIATED EMISSION ................................................................................................................................. 51 10.1. MEASUREMENT PROCEDURE ........................................................................................................... 51 10.2. TEST SETUP ......................................................................................................................................... 53 10.3. LIMITS AND MEASUREMENT RESULT ............................................................................................... 54 10.4. TEST RESULT........................................................................................................................................ 54 11. NUMBER OF HOPPING FREQUENCY ........................................................................…

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Report No.: AGC01475211103AP01 Page 1 of 2 TEST SETUP PHOTOS RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz Report No.: AGC01475211103AP01 Page 2 of 2 RF CONDUCTED TEST SETUP ****************************************End of Report*************************************