2AWT9-BSD400DDIFFUSER

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 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. Warning: changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment The devices has been evaluated to meet general RF exposure requirement， the device can be used in portable exposure condition with restriction

BIRGUS TECHNOLOGY CO.,LIMITED (July 03. 2020) MET Laboratories, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR EUT: DIFFUSER Model: BSD400D, BS-D-1020, BS-D-1030, BS-D-1050 FCC ID: 2AWT9-BSD400D 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 -Schematic -Block diagram -Operation description required to be submitted with this application be permanently withheld from public review. the above documents are company proprietary information that could never get into the possession of your competition). Please contact me if there is any information you may need. Sincerely, Signature : Name: TANG XIAOXIANG Title: Manager Company: BIRGUS TECHNOLOGY CO.,LIMITED Address: RM 1202,12/F TUNG CHUN COMM CTR 438-444 SHANGHAI ST, KOWLOON HONG KONG

BIRGUS TECHNOLOGY CO.,LIMITED (July 03. 2020) Eurofins MET Labs 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Flux Compliance Service Laboratory 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, Signature Name: TANG XIAOXIANG Title: Manager Company: BIRGUS TECHNOLOGY CO.,LIMITED Address: RM 1202,12/F TUNG CHUN COMM CTR 438-444 SHANGHAI ST, KOWLOON HONG KONG

Model difference declaration letter Differences Description We BIRGUS TECHNOLOGY CO.,LIMITED state: Product： DIFFUSER Model Name： BSD400D, BS-D-1020, BS-D-1030, BS-D-1050 The above product with same circuit, PCB layout, electrical parts, materials and wiring structures, Appearance shape, the materials of decorative accessories is same, only different color, Signatory Date: 2020-07-03 Signature Name: TANG XIAOXIANG Title: Manager Company: BIRGUS TECHNOLOGY CO.,LIMITED Address: RM 1202,12/F TUNG CHUN COMM CTR 438-444 SHANGHAI ST, KOWLOON HONG KONG

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Label and Label Location FCC ID: 2AWT9-BSD400D 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 L*W: 15mm*8mm Black font on a white label

Internal photos Photo 1 Photo 2 Photo 3 Antenna Photo 4 Photo 5

Flux Compliance Service Laboratory Room 105 Floor Bao hao Technology Building 1 NO.15 Gong ye West Road Hi-Tech Industrial, Song shan lake Dongguan Tel: 769-27280901 Fax:769-27280901 http://www.FCS-lab.com FCC Test Report Report No: FCS202006016W01 Issued for Applicant: BIRGUS TECHNOLOGY CO.,LIMITED Address: RM 1202,12/F TUNG CHUN COMM CTR 438-444 SHANGHAI ST, KOWLOON HONG KONG Product Name: DIFFUSER Brand Name: birgus Model Name: BSD400D Series Model: BS-D-1020,BS-D-1030,BS-D-1050 FCC ID: 2AWT9-BSD400D Issued By: Flux Compliance Service Laboratory Add: Room 105 Floor Bao hao Technology Building 1 NO.15 Gong ye West Road Hi-Tech Industrial, Song shan lake Dongguan Tel: 769-27280901 Fax:769-27280901 http://www.FCS-lab.com Page 2 of 27 Report No.:FCS202006016W01 Flux Compliance Service Laboratory Room 105 Floor Bao hao Technology Building 1 NO.15 Gong ye West Road Hi-Tech Industrial, Song shan lake Dongguan Tel: 769-27280901 Fax:769-27280901 http://www.FCS-lab.com TEST RESULT CERTIFICATION Applicant’s Name ................... : BIRGUS TECHNOLOGY CO.,LIMITED Address .................................. : RM 1202,12/F TUNG CHUN COMM CTR 438-444 SHANGHAI ST, KOWLOON HONG KONG Manufacture's Name .............. : BIRGUS TECHNOLOGY CO.,LIMITED Address .................................. : RM 1202,12/F TUNG CHUN COMM CTR 438-444 SHANGHAI ST, KOWLOON HONG KONG Product Description Product Name ........................ : DIFFUSER Brand Name ......................... : birgus Model Name ........................... : BSD400D Series Model .......................... : BS-D-1020,BS-D-1030,BS-D-1050 Test Standards ....................... : FCC Rules and Regulations Part 15 Subpart C, Section 231 Test Procedure ....................... : ANSI C63.10:2013 This device described above has been tested FCS, 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 FCS, this document may be altered or revised by FCS, personal only, and shall be noted in the revision of the document.. Date of Test ............................... : Date (s) of performance of tests : 15 June. 2020 ~ 30 June. 2020 Date of Issue ............................. : 30 June. 2020 Test Result ................................. : Pass Tested by : (Chris Chen) Reviewed by : (Jack Chen) Approved by : ( Andy yue) Page 3 of 27 Report No.:FCS202006016W01 Flux Compliance Service Laboratory Room 105 Floor Bao hao Technology Building 1 NO.15 Gong ye West Road Hi-Tech Industrial, Song shan lake Dongguan Tel: 769-27280901 Fax:769-27280901 http://www.FCS-lab.com Table of Contents Page 1. SUMMARY OF TEST RESULTS .......................................................................................... 6 1.1 TEST FACTORY ............................................................................................................ 7 1.2 MEASUREMENT UNCERTAINTY ................................................................................. 7 2. GENERAL INFORMATION ................................................................................................... 8 2.1 GENERAL DESCRIPTION OF THE EUT ....................................................................... 8 2.2 DESCRIPTION OF THE TEST MODES ......................................................................... 9 2.3 DESCRIPTION OF NECESSARY ACCESSORIES AND SUPPORT UNITS ................ 10 2.4 EQUIPMENTS LIST ..................................................................................................... 11 3 CONDUCTED EMISSION MEASUREMENT ....................................................................... 12 3.1 LIMIT ........................................................................................................................... 12 3.2 TEST PROCEDURE .................................................................................................... 12 3.3 TEST SETUP ............................................................................................................... 13 3.4 TEST RESULTS .......................................................................................................... 13 4. RADIATED EMISSION MEASUREMENT ........................................................................... 14 4.1 LIMIT ........................................................................................................................... 14 4.2 TEST PROCEDURE .................................................................................................... 15 4.3 TEST SETUP ............................................................................................................... 16 4.4 TEST RESULTS .......................................................................................................... 17 5. TRANSMITTER TIME ......................................................................................................... 21 5.1 LIMIT ........................................................................................................................... 21 5.2 TEST PROCEDURE .................................................................................................... 21 5.3 TEST SETUP ............................................................................................................... 21 5.4 TEST RESULTS .......................................................................................................... 21 6. 20 DB BANDWIDTH TEST ................................................................................................. 22 6.1 LIMIT ........................................................................................................................... 22 6.2 TEST PROCEDURE .................................................................................................... 22 6.3 TEST SETUP ..............................…

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Blow 1GHz for radiated emission test setup Above 1GHz for radiated emission test setup