FCC ID: V9X-STD504 2.4 GHz DSSS low power radio transceiver

0 0.3 x x x x D WR. 25 4- R 1 5 2 STD-504Model S/No: 00000000 FCC ID: V9X-STD504 IC 6079A-STD504 R 007-******

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. 5 MADE IN JAPAN MADE IN JAPAN 17.5 The permanet product label will remain safe during the product's lifespan 2:1 S.Tanaka S.Tanaka 00000 STD-504 2023.10.05 U094B01D01 SERIAL LABEL 1 2 3 4 5 P D F

GIREUIT DESIGN, ING. 7557-1 Hotaka, Azumino, Nagano, 399-8303, Japan Date: October 12, 2023 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 2.911 (d)(5) Attestation FCC ID: V9X-STD504 Circuit Design, 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. Circuit Design, 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 and is not an affiliate or subsidiary of an entity identified on the Covered List. Sincerely yours, Yukinaga Koike Circuit Design, Inc.

Saelig Co. Inc. 71A Perinton Pkwy Fairport NY 14450 585-385-1740 www.saelig.com Date: October 16, 2023 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 2.911 (d)(7) FCC US Agent Letter of Attestation FCC ID: V9X-STD504 Grantee FRN: 0017721283 To whom it may concern:

FCC US Agent Contact Person: Alan Lowne Company Name: Saelig Company, Inc. FRN: 0033976408 Company Address: 71A Perinton Pkwy Fairport, NY 14450 United States Email: alan.lowne@saelig.com This letter is to confirm that we have accepted the responsibility to act as US Agent on behalf of Circuit Design, Inc. (the applicant) for the above referenced FCC ID. We are aware of the requirements and responsibilities of the applicants agent for service of process as outlined in the FCC section 2.911(d)(7) and Report and Order FCC 22-84 paragraph 63. Sincerely yours, Signature:

Alan Lowne Saelig Company, Inc.

GIRGUIT DESIGN, INC. 7557-1 Hotaka, Azumino, Nagano, 399-8303, Japan Date: October 12, 2023 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 2.911 (d)(7) Agent Designation Attestation FCC ID: V9X-STD504 Grantee FRN: 0017721283 Circuit Design, Inc. (the applicant) as required by section 2.911(d)(7), designates the following agent, located in the United States, for purposes of acting as the applicants agent for service of process. The applicant acknowledges that they will 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. The applicant further acknowledges their responsibility under CFR 47 2.929(c) to inform the FCC whenever the agent information changes. U.S. Agent Information:

Contact Person: Alan Lowne Company Name: Saelig Company, Inc. FRN: 0033976408 Company Address: 71A Perinton Pkwy Fairport, NY 14450 United States Email: alan.lowne@saelig.com Sincerely yours, Signature:

Yukinaga Koike Circuit Design, Inc.

GIRGUIT DESIGN, INC. 7557-1 Hotaka, Azumino, Nagano, 399-8303, Japan Letter of Authorization Date: October 12, 2023 UL Verification Services Inc. 47173 Benicia Street, Fremont, CA 94538 Applicant: Circuit Design, Inc. FCC ID: V9X-STD504 To whom it may concern:

We, the undersigned, hereby authorize Akiko Nishimura of Consumer, Medical & Information Technologies Division, UL Japan, 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 Japan, Inc. on our behalf shall have the same effect as acts of our own. We, 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. 862. This authorization is valid until further written notice from the applicant. The application for the subject equipment has not been submitted to another TCB for certification. Sincerely Yours,

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MY tho Yukirraga Koike Circuit Design, Inc.

GIRGUIT DESIGN, INC. 7557-1 Hotaka, Azumino, Nagano, 399-8303, Japan Request for Modular Transmitter Approval October 12, 2023 FCC ID : V9X-STD504 Applicant: Circuit Design, Inc. This transmitter, model: STD-504 is designed by us. It complies with the modular transmitters basic requirements (Item 1 to 8) in FCC Part 15 Subpart C Section 15.212 as indicated below:

Modular Approval Checklist:

Modular approval requirement

(1) Have its own RF shielding.

(2) Have buffered modulation/data inputs.

(3) Have its own power supply regulation.

(4) Comply with the antenna and transmission system requirements of 15.203, 15.204(b) and 15.204(c). XY & ws ooOogoo a

(5) Tested in a stand-alone configuration. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in FCC 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module. The length of these lines shall be the length typical of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified and commercially available.

(6) Equipped with either a permanently affixed label or must be | [X] L |

capable of electronically displaying its FCC ID. If the FCC ID is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. xX L]

(7) Comply with any specific rules or operating requirements that ordinarily apply to a complete transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements. x]

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(8) Comply with any applicable RF exposure requirements in its final configuration: The modular transmitter complies with FCC radiation exposure requirement. Yukifiaga Koike Circuit Design, Inc.

GIRGUIT DESIGN, ING. 7557-1 Hotaka, Azumino, Nagano, 399-8303, Japan Request for Confidentiality Date: October 12, 2023 UL Verification Services Inc. 47173 Benicia Street, Fremont, CA 94538 Applicant: Circuit Design, Inc. FCC ID : V9X-STD504 To whom it may concern:

Please be advised that the following information is to be held confidential on behalf of us, referring to the FCC rules 0.457 and 0.459:

Block Diagram Theory of Operation Schematics Parts List The application contains technical information which we deem to be trade secrets and proprietary. If made public, the information might be used to the disadvantage of the applicant in the market place. Thank you for your attention to this matter. Sincerely, Uechnag 4 Yultfnaga Koike Circuit Design, Inc.

GIRGUIT DESIGN, INC. 7557-1 Hotaka, Azumino, Nagano, 399-8303, Japan Request for Short-Term Confidentiality Date: October 12, 2023 UL Verification Services Inc. 47173 Benicia Street, Fremont, CA 94538 Applicant: Circuit Design, Inc. FCC ID: V9X-STD504 To whom it may concern:

Please be advised that the following information is to be held in confidence for 180 days from the date of the Grant of Equipment Authorization based on the FCC rules 0.457 and 0.459:

External Photos Internal Photos Test Setup Photos User Manual The application contains technical information, which we deem to be trade secrets and proprietary. If made public, the information might be used to the disadvantage of the applicant in the market place. Thank you for your attention to this matter. Sincerely, aA Yukinaga Koike Circuit Design, Inc.