FCC ID: C3K1797 Wireless Input Device

6/28/2021 Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 To whom it may concern:

I, the undersigned, hereby authorize UL Verification Services, Inc. to act on our behalf in all manners relating to application for equipment authorization, including signing of all documents relating to these matters. Any and all acts carried out by UL Verification Services, Inc. on our behalf shall have the same effect as acts of our own. I, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 853(a). In authorizing UL Verification Services, Inc. as our representative, we still recognize that we are responsible to:

a) Comply with the relevant provisions of the certification program;

b) c) d) Make all necessary arrangements for the conduct of the evaluation, including provision for examining documentation and access to all areas, records (including internal audit reports) and personnel for the purposes of evaluation inspection, assessment,

(e.g. testing, surveillance, reassessment) and resolution of complaints;

Make claims regarding certification only in respect of the scope for which certification has been granted;

Not use our product certification in such a manner as to bring the Certification Division into disrepute and not make any statement regarding our product certification which the Certification Division may consider misleading or unauthorized;

Microsoft Corporation is an equal opportunity employer. e) f) g) h) i) j) Upon suspension or cancellation of certification, discontinue use of all advertising matter that contains any reference thereto and return any certification documents as required by the Certification Division;

Use certification only to indicate that products are certified as being in conformity with specified standards;

Endeavor to ensure that no certificate nor report nor any part thereof is used in a misleading manner;

that any Ensure in communication media such as documents, brochures or advertising, complies with the requirements of the Certification Division;

to our product certification reference Keep a record of all complaints made known to us relating to the products compliance with requirements of the relevant standard and to make these records available to the when requested;

Take appropriate action with respect to such complaints and any deficiencies found in products or services that affect compliance with the requirements for certification;

k) Document the actions taken. This authorization is valid until further written notice from the applicant. Sincerely, Vishwas Varadanahalli Narayan Radio Test Engineer, Microsoft Corporation. Microsoft Corporation is an equal opportunity employer.

9/19/2021 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, Maryland 21046 Subject: Class II Permissive change for FCC ID: C3K1797 (Original Grant date:

6/09/2019) TO WHOM IT MAY CONCERN:

This is to request a Class II permissive change for FCC ID: C3K1797, originally granted on 6/09/2019.The changes filed under this application are:

Change 1: Added BTLE radio to replace BT radio,legacy BT radio will be disabled. This is a software update only and no hardware changes have been made. Sincerely, Vishwas Varadanahalli Narayan Radio Test Engineer, Microsoft Corporation. Microsoft Corporation is an equal opportunity employer.

9/8/2021 Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 Subject: Request for Confidentiality for FCC ID: [C3K1797]

To Whom It May Concern:

Pursuant to the provisions of the Commissions rules 47 CFR sections 0.457(d) and 0.459, we are requesting the Commission to withhold the following attachments as confidential document from public disclosure indefinitely. Block Diagram Operational Description The above-mentioned documents contain detailed system and equipment descriptions that are considered as proprietary information in the operation of the equipment. Public disclosure of the above documents might be harmful to our company and would give competitors an unfair advantage in the market. Microsoft Corporation is an equal opportunity employer. It is our understanding that all measurement test reports, FCC ID label format and correspondence during certification review process cannot be granted as confidential documents and the information will be available for public review once the grant of equipment authorization is issued. Sincerely, Vishwas Narayan Radio Test Engineer, Microsoft Corporation. Microsoft Corporation is an equal opportunity employer.