FCC ID: 2ATM75001V2 X3 Valve Controller

YOLINK X3 Valve Controller Model: YS5001-UC oR Battery: ER34615 3.6V FCC ID: 2ATM75001V2 SN: 37FC4C57E5 Made in China www. YoSmart.com YOLINK X3 Valve Controller Model: YS7105-UC oR Battery: ER34615 3.6V FCC ID: 2ATM75001V2 SN: 37FC4C57E5 Made in China www. YoSmart.com

YoSmart Inc.

(August 18, 2023) 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: Manxiang Xu Title: Engineer

(YoSmart Inc.)

(August 18, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (FCC ID: 2ATM75001V2)

[YoSmart Inc.] (the applicant) certifies that the equipment for which authorization is sought is not covered equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely,

(Applicant signature)

(Applicant printed name) Manxiang Xu

(YoSmart Inc.)

(August 18, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (FCC ID: 2ATM75001V2)

[YoSmart Inc.] (the applicant) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing covered equipment. Sincerely,

(Applicant signature)

(Applicant printed name) Manxiang Xu

YoSmart Inc.

(August 18, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (X3 Valve Controller / YS5001-UC, YS7105-UC / FCC ID: 2ATM75001V2 ) 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 ID Label/Location Attestation Statement External Photos Block Diagram Schematics Test Report Test Setup Photos Users Manual Internal Photos Parts List / Tune Up RF Exposure Info Operational Description Cover Letter(s) SDR Software / Security Info Long-Term Confidentiality No No No No No NOTE 1 NOTE 1 No No Short-Term Confidentiality NOTE 2 No No No No No 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: Manxiang Xu Title: Engineer

YoSmart Inc. Model Difference DataAugust 17, 2023 Product description: X3 Valve Controller Model name: YS5001-UC, YS7105-UC Trade Name: YoLink FCC ID: 2ATM75001V2 All the model are the same circuit and RF module, except model names . Regards Sincerely Clients signature :

Clients name / title : Manxiang XuEngineer Contact information / address15375 Barranca Parkway, Ste G-105 Irvine, CA 92618, USA

Attestation Statements

(August 17, 2023) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA RE: Attestation Statements Part 2.911(d)(7) request for (FCC ID: 2ATM75001V2)

(YoSmart Inc.), the undersigned, hereby authorize (YoSmart Inc.) to act as our designated U.S. agent for service of process, (YoSmart Inc.) accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment.

(YoSmart Inc.) accepts the responsibility to act as designated U.S. agent for service of process, provides an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Applicant Information Company name: YoSmart Inc. Contact Name: Manxiang Xu Address: 15375 Barranca Parkway, Ste G-105 Irvine, CA 92618, USA Telephone No: 9498255958 Email: mxu@yosmart.com U.S. Agent Information:

Company Name: YoSmart Inc. Address: 15375 Barranca Parkway, Ste G-105 Irvine, CA 92618, USA Contact Name: Manxiang Xu Telephone No: 9498255958 Email: mxu@yosmart.com FRN: 0028563856 Applicant Signature:

Agent Signature:

Applicant printed name: Manxiang Xu Agent printed name: Manxiang Xu