O4G387RS HMI Control

Dayton Industrial Co. Ltd V01222025 F e de ra l C ommunic a tions C ommis s ion A uthoriz a tion a nd E va lua tion D ivis ion 7435 O a kla nd Mills R oa d C olumbia, MD 21046 U nite d S ta te s D a te : 5 Dec., 2025 R e f: A tte s ta tion S ta te me nt P a rt 2 . 9 1 1 ( d) ( 7 ) F iling FCC ID:O4G 387 D a y ton I ndus tria l C o. L td. certifies that, as of the dates of this application, Americas C ompliance C onsulting LLC dba iC e rtifi “ iCertifi” is our designated U.S . agent for service of process for the above referenced F C C ID. D a y ton I ndus tria l C o. L td. accepts to maintain an agent for no less than one year after the grantee has terminated all ma rketing a nd importa tion or the conclus ion of a ny commis s ion-re la te d proc e e ding involving the e quipme nt. iC ertifi accepts, as of the date of the filing of the application, the obligation of the designated U.S . agent for service process for the above referenced F C C ID. Des igna ted U . S . Agent Informa tion: Name Americas C ompliance consulting, LLC dba iC ertifi FCC FRN 0033399411 Address 2445 NE Divis ion S treet, S uite 202 B end, OR 97703 U nite d S ta te s Contact Person Paul Preston Telephone +1-866-885-4575 Email fccagent@ icertifi.com S incerely, D a y ton I ndus tria l C o. L td. Americas C ompliance C onsulting LLC dba iC e rtifi 0016939886 0033399411 W ong L a p F a i Paul Preston S enior P roject Manager P resident/C E O S igna ture

Dayton Industrial Co. Ltd Date: 29 Aug 2025 To: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Ref: Attestation Statements Part 2.911(d)(5)(i) and Part 2.911(d)(5)(ii) Filing Re. KDB 986446 D01 FCC ID:O4G387 Dear Sir or Madam, Dayton Industrial Co. Ltd. (“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. We also certify that Dayton Industrial Co. Ltd. (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List ( as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment . If you have any questions, please contact us. Sincerely, Contact name: Wong Lap Fai Company name: Dayton Industrial Co. Ltd. Address: Block A, 11/F, 2-12 Kwai Fat Road, Kwai Chung, N.T. Hong Kong. E-mail: [email protected] Tel: +852-24224404

Dayton Industrial Co. Ltd Date 28/3/2025 TUV SUD BABT UNLIMITED Octagon House, Concorde Way, Segensworth North, Fareham, Hampshire, PO15 5RL United Kingdom Dear Sir or Madam, We, Dayton hereby authorize Eric Li, TUV SUD Hong Kong Limited, Unit 301 -309, West Wing, Lakeside 2, 10 Science Park West Avenue, Science Park, New Territories Hong Kong, (86) 755 33323232 to act as our agent in all matters relating to applications for equipment authorization, including the signing of all documents relating to these matters. This authorization expires on 28 th March 2027. Sincerely, Company Officer: Lap Fai Wong Telephone Number: +852 2212 4494 Email: [email protected]

Dayton Industrial Co. Ltd Date (29/08/2025) TUV SUD BABT UNLIMITED Octagon House, Concorde Way, Segensworth North, Fareham, Hampshire, PO15 5RL United Kingdom Confidentiality Request FCC ID: O4G387 Pursuant to Sections 0.457(d)(1)(ii) and 0.459 of the Commission’s Rules Dayton Industrial Co. Ltd. hereby requests permanent confidential treatment of information accompanying this application as outlined below: Long Term Confidentiality is requested for the following: - Block Diagram - Schematics - Part List - Operational Description Dayton Industrial Co. Ltd. also hereby requests short-term confidential treatment of information accompanying this application as outlined below for a period of 180 days: - External Photos - Test Setup Photos - User’s Manual - Internal Photos The above materials are not available to the public and contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these matters might be harmful to the applicant and provide unjustified benefits to its competitors. These materials are only made available to clients and vendors under NDA agreement. The Applicant understands that pursuant to Rule 0.457(d)(1)(ii), disclosure of this Application and all accompanying materials will not be made before the date of the Grant for this Application. Yours sincerely, Company Officer: Wong Lap Fai (signed by FCC listed Grantee contact) Telephone Number: +852-24224404 Email: [email protected]

To :TÜV SÜD HK LTDDate : 17. Mar. 2026 Attention : Eric Li From :Wong Lap Fai Phone :(852) 2212 4494 Page 1 of 1 Declaration of Model for different Operating Software We: Wong Lap Fai Dayton Industrial Co. Ltd Officially notify TÜV SÜD HK LTD to declare that the <<Additional Model>> have the same technical construction including circuit diagram, PCB Layout, RF parameter, components and component layout, all electrical construction, firmware and mechanical construction, with <<PRODUCT>>, <<Main Test Model>>. The difference lies only in the Operating Software for working with specific type of the Dropper Seatpost (DP-MC10-RS). Each RS HMI Control has its own specific software to control the bicycle seatpost setting position. PRODUCT: RS HMI Control FCC ID: O4G387 IC: 7666A-387 Main Test Model: RS HMI Control 01 Operating Software version: V1.27 <<Additional Model>> RS HMI Control 00 Operating Software version: V1.52 <<Additional Model>> RS HMI Control 02 Operating Software version: V1.53 <<Additional Model>> RS HMI Control 03 Operating Software version: V1.5 <<Additional Model>> RS HMI Control 04 Operating Software version: V1.6 Applicant : ____________________________________________ (Applicant’s authorized signature and company Chop) Wong Lap Fai 17. Mar. 2026

Report Number:607902509901S01 EMC_SZ_FR_23.03 FCC Release 2017-06-20 TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12&13, Zhiheng Wisdomland Business Park, Guankou Erlu, Nantou, Nanshan District, Shenzhen City, 518052, P. R. China Tel. +86 755 8828 6998, Fax: +86 755 8828 5299 Page 1 of 2 FCC – Radio Frequency Exposure Report Report Number:607902509901S01Date of Issue:September 4, 2025 Model/HVIN:RS HMI Control 01, RS HMI Control 00, RS HMI Control 02 RS HMI Control 03, RS HMI Control 04 Product Type:RS HMI Control Applicant:Dayton Industrial Co., Ltd. Address:2 – 12 Kwai Fat Road, 11-A Kwai Chung, New Territories, Hong Kong Production Facility:Kendy Electronics (Dongguan) Co., Ltd. Address:No.2, Xianlin Second Road, Xinsi Huangtang Village, Hengli Town, Dongguan City, Guangdong, China Test Result:nPositiveo Negative Total pages including Appendices:2 Any use for advertising purposes must be granted in writing. This technical report may only be quoted in full. This report is the result of a single examination of the object in question and is not generally applicable evaluation of the quality of other products in regular production. For further details, please see testing and certification regulation, chapter A-3.4. Report Number:607902509901S01 EMC_SZ_FR_23.03 FCC Release 2017-06-20 TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12&13, Zhiheng Wisdomland Business Park, Guankou Erlu, Nantou, Nanshan District, Shenzhen City, 518052, P. R. China Tel. +86 755 8828 6998, Fax: +86 755 8828 5299 Page 2 of 2 RF Exposure Estimation – SAR Exempt Evaluation This exposure evaluation is intended forFCC ID: O4G387 Limit and Guidelines on Exposure to Electromagnetic Fields 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 ensure that the public is not exposed to radio frequency energy levels in excess of the Commission’s guideline. According to 447498 D01 General RF Exposure Guidance v06, no SAR is required if power is lower than the flowing threshold: The 1-g 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 • 3.0 and 7.5 are referred to as the numeric thresholds in the step 2 below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. Calculation method [(max. power of` channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] *·[√f(GHz)] ≤ 3.0 The Max Power according to the RF Report No.: 6079009901R01. Conducted Power + tune up tolerance = -1.82 dBm + 1 dB = 0.82 dBm = 1.21 mW Distance = 5 mm f (GHz) = 2.480 GHz [1.21/ 5] * SQRT (2.480) = 0.38 As 0.38 ≤ 3.0 Therefore, this device is exempt from stand-alone SAR test requirements. - TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch - Reviewed by: Prepared by:Tested by: ______________________ __________________________________________ Eric LIKevin DUCarry Cai Section ManagerEMC Project EngineerTest Engineer

Dayton Industrial Co. Ltd Antenna Specification Datasheet Manufacturer: DAYTON INDUSTRIAL CO., LTD Address: 2-12 Kwan Fat Road, 11-A Kwai Chung, New Territories, Hong Kong Model No. / Part No : 23-6090PG Antenna Specification Frequency Range2400 – 2480 MHz Antenna MaterialCopper Antenna TypeRod Antenna Max. Gain0 dBi Dimension Performance / Test Graph

Report Number:607902509901R01 EMC_SZ_FR_23.03 FCC Release 2017-06-20 TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12&13, Zhiheng Wisdomland Business Park, Guankou Erlu, Nantou, Nanshan District, Shenzhen City, 518052, P. R. China Tel. +86 755 8828 6998, Fax: +86 755 8828 5299 Page 1 of 47 FCC – TEST REPORT Report Number:607902509901R01Date of Issue:March 20, 2026 Model/HVIN:RS HMI Control 01, RS HMI Control 00, RS HMI Control 02 RS HMI Control 03, RS HMI Control 04 Product Type:RS HMI Control Applicant:Dayton Industrial Co., Ltd. Address:2 – 12 Kwai Fat Road, 11-A Kwai Chung, New Territories, Hong Kong Production Facility:Kendy Electronics (Dongguan) Co., Ltd. Address:No.2, Xianlin Second Road, Xinsi Huangtang Village, Hengli Town, Dongguan City, Guangdong, China Test Result:nPositiveo Negative Total pages including Appendices:47 Any use for advertising purposes must be granted in writing. This technical report may only be quoted in full. This report is the result of a single examination of the object in question and is not generally applicable evaluation of the quality of other products in regular production. For further details, please see testing and certification regulation, chapter A-3.4. Report Number:607902509901R01 EMC_SZ_FR_23.03 FCC Release 2017-06-20 TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12&13, Zhiheng Wisdomland Business Park, Guankou Erlu, Nantou, Nanshan District, Shenzhen City, 518052, P. R. China Tel. +86 755 8828 6998, Fax: +86 755 8828 5299 Page 2 of 47 1 Table of Contents 1 Table of Contents ............................................................................................................... 2 2 Details about the Test Laboratory ....................................................................................... 3 3 Description of the Equipment Under Test ........................................................................... 4 4 Summary of Test Standards ............................................................................................... 5 5 Summary of Test Results ................................................................................................... 6 6 General Remarks ............................................................................................................... 7 7 Test Setups ........................................................................................................................ 8 8 Systems Test Configuration .............................................................................................. 10 9 Technical Requirement ..................................................................................................... 11 9.1 Conducted Emission ..................................................................................................... 11 9.2 Conducted Peak Output Power & EIRP ........................................................................ 12 9.3 Power Spectral Density ................................................................................................. 15 9.4 Duty Cycle ..................................................................................................................... 18 9.5 6 dB Bandwidth ............................................................................................................. 21 9.6 Spurious RF Conducted Emissions............................................................................... 24 9.7 Band Edge .................................................................................................................... 29 9.8 Spurious Radiated Emissions for Transmitter ............................................................... 32 10 Test Equipment List .......................................................................................................... 46 11 System Measurement Uncertainty .................................................................................... 47 Report Number:607902509901R01 EMC_SZ_FR_23.03 FCC Release 2017-06-20 TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12&13, Zhiheng Wisdomland Business Park, Guankou Erlu, Nantou, Nanshan District, Shenzhen City, 518052, P. R. China Tel. +86 755 8828 6998, Fax: +86 755 8828 5299 Page 3 of 47 2 Details about the Test Laboratory Details about the Test Laboratory Test Site 1 Company name:TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12 & 13, Zhiheng Wisdomland Business Park, Guankou Erlu, Nantou, Nanshan District Shenzhen 518052 P.R. China Telephone:86 755 8828 6998 Fax:86 755 8828 5299 FCC RegistrationNo.:174744 FCC Deignation No.:CN1453 Report Number:607902509901R01 EMC_SZ_FR_23.03 FCC Release 2017-06-20 TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12&13, Zhiheng Wisdomland Business Park, Guankou Erlu, Nantou, Nanshan District, Shenzhen City, 518052, P. R. China Tel. +86 755 8828 6998, Fax: +86 755 8828 5299 Page 4 of 47 3 Description of the Equipment Under Test Description of the Equipment Under Test Product:RS HMI Control Model no.:RS HMI Control 01, RS HMI Control 00, RS HMI Control 02 RS HMI Control 03, RS HMI Control 04 Hardware Version Identification No. (HVIN) RS HMI Control 01, RS HMI Control 00, RS HMI Control 02 RS HMI Control 03, RS HMI Control 04 Firmware Version Identification No. (FVIN) V1.39 Product Marketing Name (PMN)RS HMI Control Brand name:N/A FCC ID:O4G387 Rating:DC 12V (Powered by Bike Battery) RF Transmission Frequency:BLE: 2402MHz – 2480MHz No. of Operated Channel:40 Modulation:GFSK Transmitter Rate:1M, 2M bps Antenna Type:Built in Rod antenna AntennaGain: 0 dBi Description of the EUT:The EUT is considered as a wireless device which has Bluetooth features, it is to be used in an E-Bike and it is mainly powered by the E-bike’s battery during operation. The Internal battery which is for the repairing, data backup and maintenance by Manufacturer onl…

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