2A2V7-OS821Otoscope

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Ningbo Albert Novosino Co., Ltd. (2022.11.08) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Otoscope / OS821 / FCC ID: 2A2V7- OS821 ) 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 Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☐ Internal Photos ☐ NOTE 1 ☐ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Signature: Name: Victor Zhou Title: Quality Manager

Ningbo Albert Novosino Co., Ltd. (2022.11.08) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology Co., Ltd.) 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: Victor Zhou Title: Quality Manager

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 3 External Photos Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 3 Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 3

Model: OS821 FCC ID: 2A2V7-OS821 Label Location

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 4 Internal Photos Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 4 ANT Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 4

1 Antenna describe 1. Antenna describe; Antenna plate PCB antenna Make name/model name SIZE 14.0mm*2.00mm Antenna gain -0.24dBi Frequency range 2.4GHZ—2.4835GHZ Format VSWR 1.5 Format Smith 50Ω Format Log Mag -18.31dB 2. External view drawing; Picture of antenna 2 Test System 3 Antenna Matching Network 4 5 6

Shenzhen CTB Testing Co., Ltd. FCC ID: 2A2V7-OS821 Portable device According to §15.247(e)(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. 2.4GWIFI: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.412 7.6 5.75 7±1 8.00 6.31 <5 1.95983 3.00 YES 2.437 7.62 5.78 7±1 8.00 6.31 <5 1.96996 3.00 YES 2.462 7.26 5.32 7±1 8.00 6.31 <5 1.98004 3.00 YES 2.412 6.4 4.37 6±1 7.00 5.01 <5 1.55675 3.00 YES 2.437 6.41 4.38 6±1 7.00 5.01 <5 1.56480 3.00 YES 2.462 6.49 4.46 6±1 7.00 5.01 <5 1.57280 3.00 YES 2.412 6.46 4.43 6±1 7.00 5.01 <5 1.55675 3.00 YES 2.437 6.42 4.39 6±1 7.00 5.01 <5 1.56480 3.00 YES 2.462 6.26 4.23 6±1 7.00 5.01 <5 1.57280 3.00 YES 2.422 5.47 3.52 5±1 6.00 3.98 <6 1.23913 3.00 YES 2.437 5.42 3.48 5±1 6.00 3.98 <7 1.24296 3.00 YES 2.452 5.72 3.73 5±1 6.00 3.98 <8 1.24678 3.00 YES 802.11b 802.11g 802.11n( HT20) 802.11n( HT40) Conclusion: For the max result : 1.98004≤ FCC Limit 3.0 for 1g SAR.

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 62 TEST REPORT Compiled by: Reviewed by: Approved by: Chen Zheng Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: Otoscope FCC ID: 2A2V7-OS821 Trademark: N/A Model Number: OS821 Prepared For: Ningbo Albert Novosino Co., Ltd. Address: No.1 Xinheng 3 Road Cicheng Town, Jiangbei District, Ningbo, China Manufacturer: Ningbo Albert Novosino Co., Ltd. Address: No.1 Xinheng 3 Road Cicheng Town, Jiangbei District, Ningbo, China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: Floor 1&2, Building A, No. 26 of Xinhe Road, Xinqiao Community, Xinqiao Street, Baoan District, Shenzhen, Guangdong, China. Sample Received Date: Oct. 19, 2022 Sample tested Date: Oct. 19, 2022 to Oct. 28, 2022 Issue Date: Oct. 28, 2022 Report No.: CTB221028032RFX Test Standards FCC Part15.247 ANSI C63.10:2013 Test Results PASS Remark: This is WIFI-2.4GHz band radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 62 TABLE OF CONTENT Test Report Declaration Page 1. VERSION .......................................................................... 3 2. TEST SUMMARY ................................................................... 4 3. MEASUREMENT UNCERTAINTY ..................................................... 5 4. PRODUCT INFORMATION AND TEST SETUP .......................................... 6 4.1 Product Information .................................................................... 6 4.2 Test Setup Configuration ............................................................... 6 4.3 Support Equipment .................................................................... 6 4.4 Channel List .......................................................................... 7 4.5 Test Mode ............................................................................ 7 4.6 Test Environment ...................................................................... 7 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................... 8 5.1 Test Facility ........................................................................... 8 5.2 Test Instrument Used .................................................................. 8 6. AC POWER LINE CONDUCTED EMISSION ............................................ 10 6.1 Block Diagram Of Test Setup .......................................................... 10 6.2 Limit ................................................................................ 10 6.3 Test procedure ....................................................................... 10 6.4 Test Result .......................................................................... 12 7. RADIATED SPURIOUS EMISSION ................................................... 14 7.1 Block Diagram Of Test Setup .......................................................... 14 7.2 Limit ................................................................................ 14 7.3 Test procedure ....................................................................... 15 7.4 Test Result .......................................................................... 16 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 38 8.1 Block Diagram Of Test Setup .......................................................... 38 8.2 Limit ................................................................................ 38 8.3 Test procedure ....................................................................... 38 8.4 Test Result .......................................................................... 39 9. COUDUCTED OUTPUT POWER ..................................................... 46 9.1 Block Diagram Of Test Setup .......................................................... 46 9.2 Limit ................................................................................ 46 9.3 Test procedure ....................................................................... 46 9.4 Test Result .......................................................................... 47 10. 6DB OCCUPIED BANDWIDTH ....................................................... 48 10.1 Block Diagram Of Test Setup ......................................................... 48 10.2 Limit ............................................................................... 48 10.3 Test procedure ...................................................................... 48 10.4 Test Result ......................................................................... 49 11. POWER SPECTRAL DENSITY ...................................................... 54 11.1 Block Diagram Of Test Setup ......................................................... 54 11.2 Limit ............................................................................... 54 11.3 Test procedure ...................................................................... 54 11.4 Test Result ......................................................................... 55 12. ANTENNA REQUIREMENT ......................................................... 60 13. EUT TEST SETUP PHOTOGRAPHS .................................................. 61 (Note: N/A means not applicable) Shenzhen CTB Testing Technology Co…

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Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221028032RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions