2AQMIGT22020True Wireless Stereo headphone

FCC Caution： This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -Reorient or relocate the receiving antenna. -Increase the separation between the equipment and receiver. -Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -Consult the dealer or an experienced radio/TV technician for help. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

(Grado Laboratories, Inc) Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2AQMIGT22020 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block Diagram, Schematics, Operational Description Block Diagram Schematics Operational Description 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. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, ( John A Grado) Rev 11/20/07

(Grado Laboratories, Inc) Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Date: SUBJECT: FCC Application for FCC ID: 2AQMIGT22020 To Whom It May Concern: We, the undersigned, hereby authorize Alan Mei at Shenzhen BCTC Testing Co., Ltd. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Alan Mei of Shenzhen BCTC Testing Co., Ltd. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, ( John A Grado)

External Photos

Label & label location FCC ID: 2AQMIGT22020 Label location Label location

Internal Photos Antenna

RF EXPOSURE EVALUATION METHOD FCC ID: 2AQMIGT22020 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-EDR max possible output power (PK,conducted)：5±1dbm 2.73dBi logarithmic terms convert to numeric result is nearly 1.875 6dbm=3.98mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=3.98/5*√2. 402 =1.23≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. Modulation Frequency (MHz) Output Power (dBm) Max Antenna Gain (dBi) GFSK 2402 -0.95 2.73 GFSK 2441 2.31 2.73 GFSK 2480 3.64 2.73 Pi/4 DQPSK 2402 0.24 2.73 Pi/4 DQPSK 2441 3.41 2.73 Pi/4 DQPSK 2480 4.64 2.73 8DPSK 2402 0.70 2.73 8DPSK 2441 3.83 2.73 8DPSK 2480 5.00 2.73 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 3.98/5*√2.441 =1.24≤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)]=3.98/5*√2.48=1.25≤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.

Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2005000091E FCC Part 15C Test Report FCC ID: 2AQMIGT22020 Product Name: True Wireless Stereo headphone Trademark: N/A Model Name : Grado GT220 Prepared For : Grado Laboratories, I nc Address : 4614- 7th Ave Brooklyn, New York 11220, United States Prepared By : Shenzhen BCTC Testing Co., Ltd. Address : BCTC Building & 1-2F, East of B Building, Pengzhou Industrial, Fuyuan 1st Road, Qiaotou Community, Fuyong Street, Bao’an District, Shenzhen, China Test Date: May 19, 2020 – May 28, 2020 Date of Report : May 28, 2020 Report No.: BCTC2005000091E Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 1 of 71 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2005000091E TEST RESULT CERTIFICATION Applicant’s name ..... Grado Laboratories, I nc Address ...................... 4614- 7th Ave Brooklyn, New York 11220, United States Manufacture's Name ......................... Antonio International Limited Address ...................... Room 2805, 28/F, Kimberland Center, 55 Wing Hong Street, Cheung Sha Wan, Kowloon, Hong Kong Product description Product name............. True Wireless Stereo headphone Trademark ................. N/A Model and/or type reference .................. Grado GT220 Standards ................. FCC Part15.247 ANSI C63.10:2013 This device described above has been tested by BCTC, and 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 BCTC, this document may be altered or revised by BCTC, personal only, and shall be noted in the revision of the document. Prepared by(Engineer): Willem Wang Reviewer(Supervisor): Eric Yang Approved(Manager): Zero Zhou Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 2 of 71 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2005000091E Table of Contents Test Report Declaration Page 1. TEST SUMMARY ...................................................... 5 2. TEST FACILITY ....................................................... 6 3. MEASUREMENT UNCERTAINTY........................................ 6 4. GENERAL INFORMATION .............................................. 7 4.1 GENERAL DESCRIPTION OF EUT ...................................... 7 4.2 Test Setup Configuration ................................................ 8 4.3 Support Equipment ..................................................... 8 4.4 Channel List ........................................................... 9 4.5 Test Mode ............................................................ 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 Test Result ........................................................... 15 7. RADIATED EMISSIONS ............................................... 17 7.1 Block Diagram Of Test Setup ........................................... 17 7.2 Limit ................................................................. 18 7.3 Test procedure ........................................................ 18 7.4 Test Result ........................................................... 20 7.5 RADIATED BAND EMISSION MEASUREMENT AND RESTRICTED BANDS OF OPERATION ........................................................... 24 8. CONDUCTED EMISSION .............................................. 27 8.1 Block Diagram Of Test Setup ........................................... 27 8.2 Limit ................................................................. 27 8.3 Test procedure ........................................................ 27 8.4 Test Result ........................................................... 28 9. 20 DB BANDWIDTH .................................................. 37 9.1 Block Diagram Of Test Setup ........................................... 37 9.2 Limit ................................................................. 37 9.3 Test procedure ........................................................ 37 9.4 Test Result ........................................................... 38 10. MAXIMUM PEAK OUTPUT POWER .................................... 43 10.1 Block Diagram Of Test Setup .......................................... 43 10.2 Limit ................................................................ 43 10.3 Test procedure ....................................................... 43 10.4 Test Result .......................................................... 44 11. HOPPING CHANNEL SEPARATION .................................... 49 11.1 Block Diagram Of Test Setup .......................................... 49 Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-007 Ver.：A.0 Page 3 of 71 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2005000091E 11.2 Limit ................................................................ 49 11.3 Test procedure ....................................................... 49 11.4 Test Result .......................................................... 50 12. NUMBER OF HOPPING FREQUENCY .................................. 55 12.1 Block Diagram Of Test Setup .......................................... 55 12.2 Limit ................................................................ 55 12.3 Test procedure ....................................................... 55 12.4 Test Result .......................................................... 56 13. …

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Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2005000091E 16. EUT TEST SETUP PHOTOGRAPHS Conducted Measurement Photos Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 69 of 71 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2005000091E Radiated Measurement Photos Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 70 of 71 Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2005000091E ※※※※※ END OF REPORT ※※※※※ Te s t Report Tel: 400-788-9558 Web: https://www.bctc-lab.com BCTC/RF-EMC-0 07 Ver.：A.0 Page 71 of 71