VYYDM25LEUS1128V1DC Tubular Motor

NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD. No.168ShengguangRoad,Luotuo,Zhenhai,NingboZHEJIANG，China Date:2025-09-23 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Ref:AttestationStatementsPart2.911(d)(5)(i)Filing FCCID:VYYDM25LEUS1128V1 ToWhomItMayConcern: NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD.certifiesthattheequipmentfor whichauthorizationissoughtisnot“covered”equipmentprohibitedfromreceivinganequipmentauthorization pursuanttosection2.903oftheFCCrules. NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD.certifiesthattheequipmentfor whichauthorizationissoughtdoesnotincludecybersecurityoranti-virussoftwareproducedorprovidedby KasperskyLab,Inc.oranyofitssuccessorsandassignees,includingequipmentwithintegratedKaspersky Lab,Inc.(oranyofitssuccessorsandassignees)cybersecurityoranti-virussoftwarepursuanttoDA-24-886 andKDB986446D01CoveredEquipmentGuidancesectionB(2a). Deviceisinherentlycompliantbasedonhardwarelimitationsorsoftwarecontrols. or ASoftwareBillofMaterials(SBOM)isprovidedtotheTCBforreview,and Theend-userorthirdpartiescannotinstalladditionalsoftwareonthisdevice. Sincerely, Signatory [xiaofangLiao,MANAGER]

NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD. No.168ShengguangRoad,Luotuo,Zhenhai,NingboZHEJIANG，China Date:2025-09-23 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Ref:AttestationStatementsPart2.911(d)(5)(ii)Filing FCCID:VYYDM25LEUS1128V1 ToWhomItMayConcern: NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD.certifiesthat,asofthedateofthe filingoftheapplication,theapplicantisnotidentifiedontheCoveredList(asaspecificallynamedentityorany ofitssubsidiariesoraffiliates)asanentityproducing“covered”equipment. Sincerely, Signatory [xiaofangLiao,MANAGER]

NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD. No.168ShengguangRoad,Luotuo,Zhenhai,NingboZHEJIANG，China Date:2025-09-22 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA FCCID:VYYDM25LEUS1128V1 ApplicantFRN:0017345455 USAgent–AttestationStatement/Part2.911(d)(7) NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD.certifiesthat,asof 2025-09-22,wehavedesignatedFCCUSAgent,LLCtoacceptserviceofprocessonour behalfforFCCID:VYYDM25LEUS1128V1. NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD.,acceptsto maintainanagentofserviceofprocessintheUnitedStatesfornolessthanoneyearafter eitherthegranteehaspermanentlyterminatedallmarketingandimportationoftheapplicable equipmentwithintheU.S.,ortheconclusionofanyCommission-relatedadministrativeor judicialproceedinginvolvingtheequipment,whicheverislater. FCCUSAgent,LLC,acceptsasofthedateofthefilingofthisapplication,theobligationof beingthedesignatedagentforthepurposeofacceptingserviceofprocessonbehalfof NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD.forFCCID: VYYDM25LEUS1128V1. DesignatedAgentInformation: CompanyName:FCCUSAgent,LLC U.S.AgentFRN:0033402884 Address:3722IllinoisAvenue,SaintCharles,IL,60174,USA ContactPerson:TimPayne Phone:708-571-3148 Email:[email protected] Sincerely, Company:NINGBODOOYAMECHANIC& ELECTRONICTECHNOLOGYCO.,LTD. DesignatedAgent:FCCUSAgent,LLC CompanyRepresentative:xiaofangLiaoDesignatedAgentRepresentative:TimPayne Signature: Signature:

NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD. No.168ShengguangRoad,Luotuo,Zhenhai,NingboZHEJIANG，China Date:2025-09-23 FEDERALCOMMUNICATIONSCOMMISSION AUTHORIZATIONANDEVALUATIONDIVISION 7435OAKLANDMILLSROAD COLUMBIA,MD21046 SUBJECT:FCCApplicationforFCCID:VYYDM25LEUS1128V1 ConfidentialityRequest Towhomitmayconcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,wearerequestingthe Commissiontowithholdthefollowingattachment(s)asconfidentialdocumentsfrompublicdisclosureindefinitely. ☒ BlockDiagram ☐ Tune-UpInformation ☒ OperationalDescription,SBOM ☐ SecurityInformation ☒ Schematics ☐ SoftwareDefinedRadio(SDR)Information ☐ PartsList Theabovematerialscontaintradesecretsandproprietaryinformationnotcustomarilyreleasedtothepublic.The publicdisclosureofthesematerialsmaybeharmfultotheapplicantandprovideunjustifiedbenefitstoits competitors. Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketingregulationsinTitle47CFR §2.803andtheimportationrulesinTitle47CFR§2.1204,whileensuringthatbusinesssensitiveinformation remainsconfidentialuntiltheactualmarketingofnewlyauthorizeddevices,werequestShortTermConfidentiality ofthefollowingattachment(s); ☒ ExternalPhotos ☒ TestSetupPhotos ☒ InternalPhotos ☒ UserManual ☐For45days,pursuanttoPublicNoticeDA04-1705. or ☒For180dayspursuanttoKDB726920D01. TheapplicantunderstandsthatpursuanttoSection0.457oftheRules,disclosureofthisapplicationandall accompanyingdocumentationwillnotbemadebeforethedateoftheGrantforthisapplication. Sincerely, Signatory [xiaofangLiao,MANAGER]

NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD. No.168ShengguangRoad,Luotuo,Zhenhai,NingboZHEJIANG，China Date:2025-09-23 FEDERALCOMMUNICATIONSCOMMISSION AUTHORIZATIONANDEVALUATIONDIVISION 7435OAKLANDMILLSROAD COLUMBIA,MD21046 SUBJECT:FCCID:VYYDM25LEUS1128V1 ModelDeclarationLetter Dear Regulatory Authority, Model(s):DM25LEU/S-0.7/28are same to the modelDM25LEU/S-1.1/28,these models are same PCB Layout , Schematics,BOM.Onlyfordifferentmodelname,brandname,appearancecolorandshellshape (non-metallicanddoesnotaffecttheelectricalstructure)fordifferentmarketrequire. Sincerely, Signatory [xiaofangLiao,MANAGER]

NINGBODOOYAMECHANIC&ELECTRONICTECHNOLOGYCO.,LTD. No.168ShengguangRoad,Luotuo,Zhenhai,NingboZHEJIANG，China Date:2025-09-23 FEDERALCOMMUNICATIONSCOMMISSION AUTHORIZATIONANDEVALUATIONDIVISION 7435OAKLANDMILLSROAD COLUMBIA,MD21046 SUBJECT:FCCApplicationforFCCID:VYYDM25LEUS1128V1 POWEROFATTORNEY ToWhomItMayConcern: We,theundersigned,herebyauthorizeWaltekTestingGroup(Shenzhen)Co.,Ltd.JandySoonourbehalf,to applytotheFederalCommunicationsCommissiononourequipment.AnyandallactscarriedoutbyWaltek TestingGroup(Shenzhen)Co.,Ltd.JandySoonourbehalfshallhavethesameeffectasactsofourown. ThisistoadvisethatweareinfullcompliancewiththeAnti-DrugAbuseAct.We,NINGBODOOYA MECHANIC&ELECTRONICTECHNOLOGYCO.,LTD.arenotsubjecttoadenialoffederalbenefits pursuanttoSection5301oftheAnti-DrugActof1988,21USC853a,andnopartytotheapplicationissubject toadenialoffederalbenefitspursuanttothatsection. Sincerely, Signatory [xiaofangLiao,MANAGER]

Reference No.: WTN25X08217011W Page 1 of 12 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn ANNEX EXHIBIT 1 - PRODUCT LABELING Proposed FCC ID Label Format Specifications: The label shall be securely affixed to a permanently attached part of the device, in a location where it is visible or easily accessible to the user, and shall not be readily detachable. The label shall be sufficiently durable to remain fully legible and intact on the device in all normal conditions of use throughout the device’s expected lifetime. Proposed Label Location on EUT FCC ID Label Location

1. RF Exposure Requirements 1.1 General Information Client Information Applicant: NINGBO DOOYA MECHANIC & ELECTRONIC TECHNOLOGY CO., LTD. Address of applicant: No.168 Shengguang Road, Luotuo, Zhenhai, Ningbo ZHEJIANG， China Manufacturer: NINGBO DOOYA MECHANIC & ELECTRONIC TECHNOLOGY CO., LTD. Address of manufacturer: No.168 Shengguang Road, Luotuo, Zhenhai, Ningbo ZHEJIANG， China General Description of EUT: Product Name: DC Tubular Motor Trade Name: / Model No.: DM25LEU/S-1.1/28 Adding Model(s): DM25LEU/S-0.7/28 Rated Voltage: Type-C input DC 5V Battery DC 7.2V Power Adaptor : / FCC ID: VYYDM25LEUS1128V1 Equipment Type: Portable device Technical Characteristics of EUT: Frequency Range: 433.92MHz Max. Field Strength: 433.92MHz: 74.72dBuV/m(3m) Data Rate: / Modulation: FSK Antenna Type: line antenna Antenna Gain: 0dBi 1.2 RF Exposure Exemption According to §1.1307(b)(3) and KDB 447498 D04 Interim General RF Exposure Guidance v01, system operating under the provisions of this section shall be operating in a manner that the public is not exposed to radio frequency energy level in excess limit for maximum permissible exposure. Option A: FCC Rule Part 1.1307 (b)(3)(i)(A):The available maximum time-averaged power is no more than 1mW, regardless of separation distance. Option B: FCC Rule Part 1.1307 (b)(3)(i)(B): The available maximum time-averaged power or effective radiated power (ERP), whichever is greater, is less than or equal to the threshold P th (mW) described in the following formula. P th is given by: Option C: FCC Rule Part 1.1307 (b)(3)(i)(C): The minimum separation distance (R in meters) from the body of a nearby person for the frequency (f in MHz) at which the source operates, the ERP (watts) is no more than the calculated value prescribed for that frequency. R must be at least λ/2π, where λ is the free-space operating wavelength in meters. Single RF Sources Subject to Routine Environmental Evaluation RF Source frequency (MHz) Threshold ERP (watts) 0.3-1.34 1,920 R 2 1.34-30 3,450 R 2 /f 2 30-300 3.83 R 2 300-1,500 0.0128 R 2 f 1,500-100,000 19.2R 2 For Multiple RF sources: FCC Rule Part 1.1307(b)(3)(ii): (A) The available maximum time-averaged power of each source is no more than 1 mW and there is a separation distance of two centimeters between any portion of a radiating structure operating and the nearest portion of any other radiating structure in the same device, except if the sum of multiple sources is less than 1 mW during the time-averaging period, in which case they may be treated as a single source (separation is not required). (B) In the case of fixed RF sources operating in the same time-averaging period, or of multiple mobile or portable RF sources within a device operating in the same time averaging period, if the sum of the fractional contributions to the applicable thresholds is less than or equal to 1 as indicated in the following equation. 1.3 Calculated Result Radio Access Technology Prediction Frequency Max. Field Strength Antenna Gain Output Power Tune-Up Power ERP (MHz) (dBuV/m) (dBi) (dBm) (dBm) (dBm) SRD 433.92 74.72 0 -20.54 -20.00 -22.15 Frequency Option Min. Distance Max. Power Exposure Limit Ratio Result (MHz) (cm) (dBm) (mW) (mW) Pass/Fail 433.92 B 0.5 -20.00 0.01 23.17 0.01 Pass Note: 1. EIRP= E-104.8+20logD; Output Power=EIRP- Antenna Gain; ERP=EIRP-2.15dB 2. Option A, B and C refers as clause 1.2. 3. For option B, Max (time-averaged power, effective radiated power (ERP)) converts to Max. Power. For option C, ERP converts to Max. Power; 4. For option B, P th (mW) converts to Exposure Limit (mW); For option C, ERP (W) converts to Exposure Limit (mW). 5. Ratio= Tune-Up ERP (mW)/ Exposure Limit (mW) Mode for Simultaneous Multi-band Transmission: Radio Access Technology Ratio 1 Ratio 2 Ratio 3 Simultaneous Ratio Limit Result Pass/Fail / / / / / / / Result: Pass

4 1 . 8 0 0 1 2 M A X 5 ± 2 1 7 7 . 5 ± 5mm

Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 1 of 31 TEST REPORT Reference No. .................... : WTN25X08217011W FCC ID ................................ : VYYDM25LEUS1128V1 Applicant ........................... : NINGBO DOOYA MECHANIC & ELECTRONIC TECHNOLOGY CO., LTD. Address ............................. : No.168 Shengguang Road, Luotuo, Zhenhai, Ningbo ZHEJIANG，China Manufacturer ..................... : The same as Applicant Address ............................. : The same as Applicant Product Name ................... : DC Tubular Motor Model No... ......................... : DM25LEU/S-1.1/28 Standards .......................... : FCC Part 15.231 Date of Receipt sample .... : 2025-08-13 Date of Test........................ : 2025-08-13 to 2025-09-01 Date of Issue ..................... : 2025-09-01 Test Report Form No. ....... : WTX_Part 15_231W Test Result ......................... : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of approver. Prepared By: Waltek Testing Group (Shenzhen) Co., Ltd. Address: 1/F., Room 101, Building 1, Hongwei Industrial Park, Liuxian 2nd Road, Block 70 Bao'an District, Shenzhen, Guangdong, China Tel.: +86-755-33663308 Fax.: +86-755-33663309 Email: [email protected] Tested by: Approved by: Gala Wang/Project Engineer Jason Su/Manager Reference No.: WTN25X08217011W Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 2 of 31 TABLE OF CONTENTS 1. GENERAL INFORMATION .................................................................................................................................... 4 1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ......................................................................... 4 1.2 TEST STANDARDS ................................................................................................................................................. 5 1.3 TEST METHODOLOGY ........................................................................................................................................... 5 1.4 TEST FACILITY ...................................................................................................................................................... 5 1.5 EUT SETUP AND TEST MODE .............................................................................................................................. 6 1.6 MEASUREMENT UNCERTAINTY ............................................................................................................................. 7 1.7 TEST EQUIPMENT LIST AND DETAILS ................................................................................................................... 8 2. SUMMARY OF TEST RESULTS ......................................................................................................................... 12 3. ANTENNA REQUIREMENT ................................................................................................................................. 13 3.1 STANDARD APPLICABLE ..................................................................................................................................... 13 3.2 TEST RESULT ...................................................................................................................................................... 13 4. RADIATED EMISSIONS ....................................................................................................................................... 14 4.1 STANDARD APPLICABLE ..................................................................................................................................... 14 4.2 TEST PROCEDURE .............................................................................................................................................. 15 4.3 CORRECTED AMPLITUDE & MARGIN CALCULATION ........................................................................................... 16 4.4 SUMMARY OF TEST RESULTS/PLOTS ................................................................................................................. 16 5. 20DB BANDWIDTH ............................................................................................................................................... 21 5.1 STANDARD APPLICABLE ..................................................................................................................................... 21 5.1 TEST PROCEDURE .............................................................................................................................................. 21 5.2 SUMMARY OF TEST RESULTS/PLOTS ................................................................................................................. 21 6. TRANSMISSION TIME .......................................................................................................................................... 23 6.1 STANDARD APPLICABLE ..................................................................................................................................... 23 6.2 TEST PROCEDURE .............................................................................................................................................. 23 6.3 SUMMARY OF TEST RESULTS/PLOTS ................................................................................................................. 23 7. DUTY CYCLE ......................................................................................................................................................... 25 7.1 STANDARD APPLICABLE ..................................................................................................................................... 25 7.2 TEST PROCEDURE .............…

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