2AZUV-M20intelligent sterilization visual ultrasonic teeth cleaning device

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.

Shenzhen Aomei Hengye Technology Co., Ltd. Model Difference Product Name: intelligent sterilization visual ultrasonic teeth cleaning device Model Number: M20, M21, M22, M23, M30, M31, M32, M33, M40, M41, M42, M43, M24，M25, M26, M27, M28, M29 FCC Identifier: 2AZUV-M20 All the models are the same circuit and RF module, except the mode names and outlook color. Regards Sincerely Client’s signature Client’s name / title: Kimi Ouyang / Manager Contact information: 405A, 4th Floor, Building 3, Haochuang Longhua Industrial Park, No.95 Yousong Road, Fukang Community, Longhua Street, Longhua District, Shenzhen

Shenzhen Aomei Hengye Technology Co., Ltd. 1/1 Letter of Authorization Company: Shenzhen Aomei Hengye Technology Co., Ltd. Address: 405A, 4th Floor, Building 3, Haochuang Longhua Industrial Park, No.95 Yousong Road, Fukang Community, Longhua Street, Longhua District, Shenzhen Product Name: intelligent sterilization visual ultrasonic teeth cleaning device Model Number: M20, M21, M22, M23, M30, M31, M32, M33, M40, M41, M42, M43, M24，M25, M26, M27, M28, M29 FCC Identifier: 2AZUV-M20 We authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, to act on our behalf on all matters concerning the above named equipment. Any individual within LGAI Technological Center S.A. is authorized to act on our behalf and take action on the application. We declare that authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by LGAI Technological Center S.A. on our behalf shall have the same effect as acts of our own. Name: Kimi Ouyang Date: 2021-05-07 Title: Manager Signature of applicant:

Shenzhen Aomei Hengye Technology Co., Ltd. 1/1 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date: 2021-05-07 Subject: Request for Confidentiality FCC ID: 2AZUV-M20 To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules (47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. 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 No ☐ Internal Photos No ☐ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No NOTE 1: Long-Term Confidentiality may be permitted under special conditions (See II. LONG-TERM CONFIDENTIALITY, Section 3 of KDB 726920, use last in force) NOTE 2: Short-Term Confidentiality can be requested for a maximum of 180 days from the date of the grant. 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. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Kimi Ouyang Title: Manager

EUT PHOTO(External Photos)

Size:10.5*7.5mm M/N: M20 FCC ID: 2AZUV-M20 Label location

EUT PHOTO(Internal Photos) ANT 1 Photo s ※※※※※ END OF REPORT ※※※※※

FCC ID: 2AZUV-M20 RF Exposure Evaluation According to KDB 447498 and part 2.1093，Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(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 Here, For wifi 802.11b Mode tune-up power. (dBm) Max. tune-up power. (dBm) tune-up power. (mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 8±1 9 7.94 2412 5 2.47 3.0 So a SAR test is not required

Project No.: ZKT-210425L1480E Page 1 of 55 FCC TEST REPORT FCC ID:2AZUV-M20 Report Number. ............................ : ZKT-210425L1480E Date of Test..............................................:Apr. 25, 2021 to May. 08, 2021 Date of issue.................................. : May. 08, 2021 Total number of pages ..................... 56 Test Result..................................... : PASS Testing Laboratory. ...................... : Shenzhen ZKT Technology Co., Ltd. Address ....................................... : 1/F, No. 101, Building B, No. 6, Tangwei Comm unity Industrial A venue, Fuhai Street, Bao'an District, Shenzhen, China Applicant's name ........................ : Shenzhen Aomei Hengye Technology Co., Ltd. Address ....................................... : 405A, 4th Floor, Building 3, Haochuang Longhua Industrial Park, No. 95 Yousong Road, Fukang Community, Longhua Street, Longhua District, Shenzhen Manufacturer's name .................. : Shenzhen Aomei Hengye Technology Co., Ltd. Address ....................................... : 405A, 4th Floor, Building 3, Haochuang Longhua Industrial Park, No. 95 Yousong Road, Fukang Community, Longhua Street, Longhua District, Shenzhen Test specification: Standard........................................ : FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2013 Test procedure............................... : / Non-standard test method ............. : N/A Test Report Form No. ................... : TRF-EL-110_V0 Test Report Form (s) Originator .... : ZKT Testing Master TRF ................................. : Dated: 2020-01-06 This device described above has been tested by ZKT, 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 ZKT, this document may be altered or revised by ZKT, personal only, and shall be noted in the revision of the document. Product name ............................... : intelligent sterilization visual ultrasonic teeth cleaning device Tradem ark ................................... : N/A Model/ Ty pe reference ..................... : M20 M21, M22, M23, M30, M31, M32, M33, M40, M41, M42, M43, M24， M25, M26, M27, M28, M29 Ratings .......................................... : DC 3.7V from battery DC 5V from charger Project No.: ZKT-210425L1480E Page 2 of 55 Testing procedure and testing location: Testing Laboratory.................................: Shenzhen ZKT Technology Co., Ltd. Address ..................................................: 1/F, No. 101, Building B, No. 6, Tangwei Community Industrial Avenue, Fuhai Street, Bao'an District, Shenzhen, China Alen He Tested by (name + signature)....................: Joe Liu Reviewer (name + signature) ....................: Lake Xie Approved (name + signature)....................: Project No.: ZKT-210425L1480E Page 3 of 55 Table of Contents Page 1. VERSION ................................................................................................................................... 5 2. SUMMARY OF TEST RESULTS ........................................................................................... 6 2.1 TEST FACILITY.................................................................................................................... 7 2.2 MEASUREMENT UNCERTAINTY ...................................................................................... 7 3. GENERAL INFORMATION ..................................................................................................... 8 3.1 GENERAL DESCRIPTION OF EUT .................................................................................... 8 3.2 DESCRIPTION OF TEST MODES ...................................................................................... 9 3.3 BLOCK DIGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED................. 9 3.4 DESCRIPTION OF SUPPORT UNITS(CONDUCTED MODE) .......................................... 9 3.5EQUIPMENTS LIST FOR ALL TEST ITEMS..................................................................... 10 4. EMC EMISSION TEST........................................................................................................... 11 4.1 CONDUCTED EMISSION MEASUREMENT .....................................................................11 4.1.1 POWER LINE CONDUCTED EMISSION Limits ......................................................11 4.1.2 TEST PROCEDURE ...................................................................................................11 4.1.3 DEVIATION FROM TEST STANDARD .....................................................................11 4.1.4 TEST SETUP ..............................................................................................................11 4.1.5 EUT OPERATING CONDITIONS ...............................................................................11 4.1.6 TEST RESULT ........................................................................................................... 12 4.2 RADIATED EMISSION MEASUREMENT ......................................................................... 14 4.2.1 RADIATED EMISSION LIMITS ................................................................................. 14 4.2.2 TEST PROCEDURE .................................................................................................. 14 4.2.3 DEVIATION FROM TEST STANDARD .................................................................... 15 4.2.4 TEST SETUP ............................................................................................................. 15 4.2.5 EUT OPERATING CONDITIONS .............................................................................. 16 4.2.6 TEST RESULTS ........................................................................................................ 17 5.RADIATED BAND EMISSIONMEASUREMENT ..…

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EUT TEST PHOTO