2ALHZNB-1700Bluetooth headphones

KO-STAR DEVELOPMENT CO.,LTD Feb.25, 2021 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject: Explanation of differences between product types FCC ID : 2ALHZNB-1700 Model Number: MZX5400, MZX5400-BLK, MZX5400-CGRY, MZX5400-MT, MZX5400-ICY, NB-1100F, NB-1100, NB-1100FS, NB-1100BF, NB-1300B, NB-1300BF, NB-1300, NB-1050, NB-1060, NB-1069,NB-1090, NB-1090P, NB-1070, NB-1070S, NB-1094, NB-1093, NB-1700, NB-1600, N2030, NB-1092, NB-1093, NB-1095 To Whom It May Concern: We, The KO-STAR DEVELOPMENT CO., LTD hereby declare that the models are identical except the the appearance color. Except for the different above, no other modification is performed. Sincerely, Signature: KO-STAR DEVELOPMENT CO., LTD Contact person: LING YAN

KO-STAR DEVELOPMENT CO., LTD Agent Authorization Company: KO-STAR DEVELOPMENT CO., LTD Address: No.3, Yicun Industrial Area, Xikeng, Henggang Town, Longgang District Shenzhen, China Product Name: Bluetooth headphones Model Number(s): MZX5400, MZX5400-BLK, MZX5400-CGRY, MZX5400-MT, MZX5400- ICY, NB-1100F, NB-1100, NB-1100FS, NB-1100BF, NB-1300B, NB-1300BF, NB-1300, NB- 1050, NB-1060, NB-1069,NB-1090, NB-1090P, NB-1070, NB-1070S, NB-1094, NB-1093, NB-1700, NB-1600, N2030, NB-1092, NB-1093, NB-1095 Product Description: Bluetooth 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: 2021-04-25 Name: LING YAN Company: KO-STAR DEVELOPMENT CO., LTD

KO-STAR DEVELOPMENT CO., LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2021-03-04 Subject; Request for Confidentiality FCC ID: 2ALHZNB-1700 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 KO-STAR DEVELOPMENT CO., LTD Contact person: LING YAN

External Photos ALL VIEW-1 OF EUT EXTERNAL VIEW-1 OF EUT EXTERNAL VIEW-2 OF EUT EXTERNAL VIEW-3 OF EUT EXTERNAL VIEW-4 OF EUT EXTERNAL VIEW-5 OF EUT EXTERNAL VIEW-6 OF EUT EXTERNAL VIEW-7 OF EUT EXTERNAL VIEW-8 OF EUT

FCC ID Label Location 5mm&15mm FCC ID: 2ALHZNB-1700

Internal Photos INTERNAL VIEW-1 OF EUT INTERNAL VIEW-2 OF EUT INTERNAL VIEW-3 OF EUT INTERNAL VIEW-4 OF EUT INTERNAL VIEW-5 OF EUT INTERNAL VIEW-6 OF EUT Antenna INTERNAL VIEW-7 OF EUT

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description Bluetooth headphones Model Name MZX5400 FCC ID 2ALHZNB-1700 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 BR/EDR: P t = 3.629dBm=2.31mW 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=(2.31mW /5mm) .[√2.480GHz)]=0.73<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.: AGC05177201205FE03 FCC ID : 2ALHZNB-1700 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Bluetooth headphones BRAND NAME : N/A MODEL NAME : See page 5 APPLICANT : KO-STAR DEVELOPMENT CO., LTD DATE OF ISSUE : Mar. 03, 2021 STANDARD(S) : FCC Part 15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC05177201205FE03 Page 2 of 72 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / Mar. 03, 2021 Valid Initial Release Report No.: AGC05177201205FE03 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 ..................................................................................................................................... 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.: AGC05177201205FE03 Page 4 of 72 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 PROCEDURE .................…

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Report No.: AGC05177201205FE03 Page 59 of 72 14. FCC LINE CONDUCTED EMISSION TEST 14.1. LIMITS OF LINE CONDUCTED EMISSION TEST Frequency Maximum RF Line Voltage Q.P. (dBμV) Average (dBμV) 150kHz~500kHz 66-56 56-46 500kHz~5MHz 56 46 5MHz~30MHz 60 50 Note: 1. The lower limit shall apply at the transition frequency. 2. The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50 MHz. 14.2. BLOCK DIAGRAM OF LINE CONDUCTED EMISSION TEST EUT & Support Units Report No.: AGC05177201205FE03 Page 60 of 72 14.3. PRELIMINARY PROCEDURE OF LINE CONDUCTED EMISSION TEST 1. The equipment was set up as per the test configuration to simulate typical actual usage per the user’s manual. When the EUT is a tabletop system, a wooden table with a height of 0.8 meters is used and is placed on the ground plane as per ANSI C63.10 (see Test Facility for the dimensions of the ground plane used). When the EUT is a floor-standing equipment, it is placed on the ground plane which has a 3-12 mm non-conductive covering to insulate the EUT from the ground plane. 2. Support equipment, if needed, was placed as per ANSI C63.10. 3. All I/O cables were positioned to simulate typical actual usage as per ANSI C63.10. 4. All support equipment received AC120V/60Hz power from a LISN, if any. 5. The EUT received DC 5V power from adapter which received AC120V/60Hz power from a LISN. 6. The test program was started. Emissions were measured on each current carrying line of the EUT using a spectrum Analyzer / Receiver connected to the LISN powering the EUT. The LISN has two monitoring points: Line 1 (Hot Side) and Line 2 (Neutral Side). Two scans were taken: one with Line 1 connected to Analyzer / Receiver and Line 2 connected to a 50 ohm load; the second scan had Line 1 connected to a 50 ohm load and Line 2 connected to the Analyzer / Receiver. 7. Analyzer / Receiver scanned from 150 kHz to 30MHz for emissions in each of the test modes. 8. During the above scans, the emissions were maximized by cable manipulation. 9. The test mode(s) were scanned during the preliminary test. Then, the EUT configuration and cable configuration of the above highest emission level were recorded for reference of final testing. 14.4. FINAL PROCEDURE OF LINE CONDUCTED EMISSION TEST 1. EUT and support equipment was set up on the test bench as per step 2 of the preliminary test. 2. A scan was taken on both power lines, Line 1 and Line 2, recording at least the six highest emissions. Emission frequency and amplitude were recorded into a computer in which correction factors were used to calculate the emission level and compare reading to the applicable limit. If EUT emission level was less – 2dB to the A.V. limit in Peak mode, then the emission signal was re-checked using Q.P and Average detector. 3. The test data of the worst case condition(s) was reported on the Summary Data page. Report No.: AGC05177201205FE03 Page 61 of 72 14.5. TEST RESULT OF LINE CONDUCTED EMISSION TEST Line Conducted Emission Test Line 1-L Report No.: AGC05177201205FE03 Page 62 of 72 Line Conducted Emission Test Line 2-N RESULT: PASS Note: All the test modes had been tested, the mode 9 was the worst case. Only the data of the worst case would be record in this test report. Report No.: AGC05177201205FE03 Page 63 of 72 APPENDIX A: PHOTOGRAPHS OF TEST SETUP RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz Report No.: AGC05177201205FE03 Page 64 of 72 CONDUCTED TEST SETUP CONDUCTED EMISSION TEST SETUP Report No.: AGC05177201205FE03 Page 65 of 72 APPENDIX B: PHOTOGRAPHS OF EUT ALL VIEW-1 OF EUT EXTERNAL VIEW-1 OF EUT Report No.: AGC05177201205FE03 Page 66 of 72 EXTERNAL VIEW-2 OF EUT EXTERNAL VIEW-3 OF EUT Report No.: AGC05177201205FE03 Page 67 of 72 EXTERNAL VIEW-4 OF EUT EXTERNAL VIEW-5 OF EUT Report No.: AGC05177201205FE03 Page 68 of 72 EXTERNAL VIEW-6 OF EUT EXTERNAL VIEW-7 OF EUT Report No.: AGC05177201205FE03 Page 69 of 72 EXTERNAL VIEW-8 OF EUT INTERNAL VIEW-1 OF EUT Report No.: AGC05177201205FE03 Page 70 of 72 INTERNAL VIEW-2 OF EUT INTERNAL VIEW-3 OF EUT Report No.: AGC05177201205FE03 Page 71 of 72 INTERNAL VIEW-4 OF EUT INTERNAL VIEW-5 OF EUT Antenna Report No.: AGC05177201205FE03 Page 72 of 72 INTERNAL VIEW-6 OF EUT INTERNAL VIEW-7 OF EUT ----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 …

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