2ACP4-BT180Bluetooth Headphone

Sentry Industries Limited 507 Houston Center, 63 Mody Road, Tst, Hong Kong, China Apr. 03, 2020 Federal Communications Commission 445 12 th Street SW Washington, DC 20554 Subject: Limited Agency Agreement Sentry Industries Limited FCC ID: 2ACP4-BT180 To Whom It May Concern: We, Sentry Industries Limited hereby authorized Intertek Testing Services to act as our Agent for the purpose of preparing application for FCC ID number (2ACP4-BT180) under all applicable parts of the FCC rules and regulations. The effective date of this limited agency agreement is (2020-04-07). The Limited Agency Agreement expires until further notice, unless sooner terminated or extended by written notice to Intertek Testing Services and the Federal Communications Commission. This is to advise that we are in full compliance with the Anti-Drug Abuse Act. The applicant is not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 U.S.C. 862, and no party to the application is subject to a denial of federal benefits pursuant to that section. If you have any questions or comments, please do not hesitate to contact me. Sincerely, [Signature] Sentry Industries Limited Contact person: Peetu Melwani

Sentry Industries Limited 507 Houston Center, 63 Mody Road, Tst, Hong Kong, China Apr. 03, 2020 Federal Communication Commission Authorization and Evaluation Division FCC ID: 2ACP4-BT180 Re: Confidentiality Request Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, the applicant hereby requests confidential treatment of information applied this application as outlined below: 1: Block Diagram 2: Schematics 3: Operational Description The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these matters might be harmful to the applicant and provide unjustified benefits to its competitors. The Applicant understands that pursuant to Rules 0.457, disclosure of this Application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Sentry Industries Limited Contact person: Peetu Melwani

FCC ID Label Location Size: 8mm*13mm ` FCC ID: 2ACP4-BT180

Internal Photos OPEN VIEW-1 OF EUT INTERNAL VIEW OF EUT-1 Antenna INTERNAL VIEW OF EUT-2 VIEW OF BATTERY

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description Bluetooth Headphone Model Name BT180, BT181, BT182, BT185, BT186 FCC ID 2ACP4-BT180 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 P t =-2.446dBm=1.76mW 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=(1.76mW /5mm) .[√2.402(GHz)]= 0.55<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 61 FCC Test Report Report No.: AGC08189200301FE03 FCC ID : 2ACP4-BT180 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Bluetooth Headphone BRAND NAME : SENTRY MODEL NAME : BT180, BT181, BT182, BT185, BT186 APPLICANT : Sentry Industries Limited DATE OF ISSUE : Apr. 01, 2020 STANDARD(S) : FCC Part 15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd CAUTION: This report shall not be reproduced except in full without the written permission of the test laboratory and shall not be quoted out of context. Report No.: AGC08189200301FE03 Page 2 of 61 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / Apr. 01, 2020 Valid Initial Release Report No.: AGC08189200301FE03 Page 3 of 61 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 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 ..................................................................................................................................... 18 8.1. MEASUREMENT PROCEDURE ........................................................................................................... 18 8.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 18 8.3. LIMITS AND MEASUREMENT RESULTS ............................................................................................. 18 9. CONDUCTED SPURIOUS EMISSION ........................................................................................................ 23 9.1. MEASUREMENT PROCEDURE ........................................................................................................... 23 9.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 23 9.3. MEASUREMENT EQUIPMENT USED .................................................................................................. 23 Report No.: AGC08189200301FE03 Page 4 of 61 9.4. LIMITS AND MEASUREMENT RESULT ............................................................................................... 23 10. RADIATED EMISSION ............................................................................................................................... 31 10.1. MEASUREMENT PROCEDURE ......................................................................................................... 31 10.2. TEST SETUP ....................................................................................................................................... 33 10.3. LIMITS AND MEASUREMENT RESULT ............................................................................................. 34 10.4. TEST RESULT ..................................................................................................................................... 34 11. NUMBER OF HOPPING FREQUENCY ..................................................................................................... 44 11.1. MEASURE…

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