2ATHVDDF-350Pistol Grip Transmitter

SHENZHENDUMBOMODELCO.,LTD. CoveredEquipmentCertificationAttestationLetter 11/23/2023 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA ATTN.:ReviewingEngineer FCCID:2ATHVDDF-350 SHENZHENDUMBOMODELCO.,LTD.certifiesthattheequipmentforwhich authorizationissoughtisnot“covered”equipmentprohibitedfromreceivingan equipmentauthorizationpursuanttosection2.903oftheFCCrules. Note:Iftheequipmentforwhichtheapplicantseeksauthorizationisproducedby anyoftheentitiesidentifiedonthecurrentCoveredList,theapplicantshould includeanexplanationonwhytheequipmentisnot“covered”equipment. SHENZHENDUMBOMODELCO.,LTD.certifiesthat,asofthedateofthefilingofthe application,theapplicantisnotidentifiedontheCoveredListasanentityproducing “covered”equipment. Signed: Printedname:LeiyuFang Title:GeneralManager CompanyName:SHENZHENDUMBOMODELCO.,LTD. Date:11/23/2023

DATE:2023-11-23 FederalCommunicationsCommission Authorization&EvaluationDivision 7345OaklandMillsRoad Columbia,Maryland21046 AuthoritytoActasAgent Onourbehalf,IappointJasonWuofGlobalUnitedTechnologyServicesCo.,Ltd.andNo. 123-128,TowerA,JinyuanBusinessBuilding,No.2,LaodongIndustrialZone,XixiangRoad, BaoanDistrict,Shenzhen,Guangdong,Chinatoactasouragentinthepreparationofthis applicationforequipmentcertification.Icertifythatsubmitteddocumentsproperlydescribe thedeviceorsystemforwhichequipmentcertificationissought.Ialsocertifythateach unitmanufactured,importedormarketed,asdefinedintheFederalCommunications Commission’sregulationswillhaveaffixedtoitalabelidenticaltothatsubmittedfor approvalwiththisapplication. Forinstanceswhereourauthorizedagentsignstheapplicationforcertificationonour behalf,Iacknowledgethatallresponsibilityforcomplyingwiththetermsandconditions forcertification,stillresideswithSHENZHENDUMBOMODELCO.,LTD.andC301, KedasiIndustrialPark,XintianMarket,GuanlanTown,LonghuaDistrict,Shenzhen, Guangdong,China Signature: Name:LeiyuFang Title:GeneralManager Company:SHENZHENDUMBOMODELCO.,LTD.

SHENZHENDUMBOMODELCO.,LTD. DATE:2023-11-23 EquipmentAutorisationDivision FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 FCCID:2ATHVDDF-350 ProductName:PistolGripTransmitter RequestforConfidentiality ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and §0.459,wearerequestingtheCommissiontowithholdthefollowingattachment(s)as confidentialdocumentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandare consideredasproprietaryinformationinoperationoftheequipment.Thepublic disclosureofthesedocumentsmightbeharmfultoourcompanyandwouldgive competitorsanunfairadvantageinthemarket. SchematicDiagram BlockDiagram OperationalDescription Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketing regulationsinTitle47CFR§2.803andtheimportationrulesinTitle47CFR§2.1204, whileensuringthatbusinesssensitiveinformationremainsconfidentialuntiltheactual marketingofnewlyauthorizeddevices,werequestShortTermConfidentialityofthe followingattachment(s); ExternalPhotos TestSetupPhotos InternalPhotos UserManual For45days,pursuanttoPublicNoticeDA04-1705. OR For180dayspursuanttoKDB726920D01. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondenceduringthecertificationreviewprocesscannotbegrantedasconfidential documentsandthisinformationwillbeavailableforpublicreviewoncethegrantof equipmentauthorizationisissued. Signature: Name:LeiyuFang Title:GeneralManager Company:SHENZHENDUMBOMODELCO.,LTD.

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FCC ID: 2ATHVDDF-350 RF Exposure evaluation According to 447498 D04 Interim General RF Exposure Guidance v01 ERP/EIRP = P T +G T −L C ERP/EIRP is the equivalent (or effective) radiated power [in same units as P T , typically dBW, dBm, or power spectral density (psd)], relative to either a dipole antenna (ERP) or an isotropic antenna (EIRP). P T is the transmitter output power, in dBW, dBm, or psd (power over a specified reference bandwidth). G T is the gain of the transmitting antenna, in dBd (ERP) or dBi (EIRP). L C is the signal attenuation in the connecting cable between the transmitter and the antenna, in dB. For 2.4G mode Frequency (MHz) Output power to antenna (dBm) Ant gain(dBi) EIRP(dBm) ERP(dBm) ERP(mw) Distance (cm) P th (mW) 2402 -3.84 2 -1.84 -3.99 0.399 0.5 2.8 ERP = EIRP −2.15 dB WORSE CASE 0.399mW<2.8mW Remark: Then SAR evaluation is not required

SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 1 Acceptance of product specifications Mobile communication terminal antenna Client Name： DUMBO Product Name： 2.4G brass antenna Material code ： 1.Purpose To standardize the specifications and test methods of mobile communication terminal antennas produced by SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD to avoid errors caused by different test conditions and methods. 2.Product Category and Product Mode Description 2.1 Category The mobile communication terminal antenna is monopole antenna 2.2 Product Mode Description This report is mainly summarized that 2.4G antenna project is designed by antenna electrical result. This antenna is designed for: 2400~2500MHz frequency band. 3.Technical Indicators And Instrument Equipment 3.1 Technique Data Electrical Performance Parameters For Product Operating Frequency Range 2400~2500MHz VSWR 2400~2500MHz < 2.0 SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 2 Antenna gain 2400~2500MHz :2.0dBi Radiant efficiency 2400~2500MHz>60% Impedance 50 ohm Product Material Description Coaxial line + Copper pipe Product Environment Description Operation Temperature - 30 ̊C ~ + 85 ̊C Storage Temperature - 30 ̊C ~ + 85 ̊C 3.2 Instrument Equipment SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 3 4.Description of matching circuit: Our company has not modified the matching circuit of the antenna Element Value Vender E1(0402) E2(0402) E3(0402) Antenna E3 E1 11 3 RF Module E2 SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 4 5.Electrical performance parameters of antenna（VSWR，Gain，Efficiency， directional diagram） VSWR Efficiency and Gain SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 5 E1 directional diagram E2 directional diagram SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 6 E3 directional diagram 3D Pattern SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 7 5. Product Structure： SHENZHEN DEWEIMA COMMUNICATION EQUIPMENT CO., LTD 8 6.Real product photo： 7.Packing Way： Bags shipped

Global United Technology Services Co., Ltd. Report No.: GTS2023090071F01 Authorized Signature: Robinson Luo Laboratory Manager This 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 compiler and approver. Page 1 of 25 TEST REPORT Applicant: SHENZHEN DUMBO MODEL CO., LTD. Address of Applicant: C301, Kedasi Industrial Park, Xintian Market, Guanlan Town, Longhua District, Shenzhen, Guangdong, China Manufacturer/Factory: SHENZHEN DUMBO MODEL CO., LTD. Address of Manufacturer/Factory: C301, Kedasi Industrial Park, Xintian Market, Guanlan Town, Longhua District, Shenzhen, Guangdong, China Equipment Under Test (EUT) Product Name: Pistol Grip Transmitter Model No.: DDF-350 Trade Mark: DUMBORC FCC ID: 2ATHVDDF-350 Applicable standards: FCC CFR Title 47 Part 15 Subpart C Section 15.247 Date of sample receipt: September 06, 2023 Date of Test: September 07, 2023-November 23, 2023 Date of report issued: November 24, 2023 Test Result : PASS * * In the configuration tested, the EUT complied with the standards specified above. Report No.: GTS2023090071F01 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 2 of 25 2 Version Version No. Date Description 00 November 24, 2023 Original Prepared By: Date: November 24, 2023 Project Engineer Check By: Date: November 24, 2023 Reviewer Report No.: GTS2023090071F01 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 3 of 25 3 Contents Page 1 COVER PAGE ................................................................................................................................................ 1 2 VERSION ........................................................................................................................................................ 2 3 CONTENTS .................................................................................................................................................... 3 4 TEST SUMMARY ........................................................................................................................................... 4 4.1 MEASUREMENT UNCERTAINTY .................................................................................................................. 4 5 GENERAL INFORMATION ............................................................................................................................ 5 5.1 GENERAL DESCRIPTION OF EUT ............................................................................................................... 5 5.2 TEST MODE .............................................................................................................................................. 7 5.3 TEST FACILITY .......................................................................................................................................... 7 5.4 TEST LOCATION ....................................................................................................................................... 7 5.5 DESCRIPTION OF SUPPORT UNITS ............................................................................................................. 7 5.6 DEVIATION FROM STANDARDS ................................................................................................................... 7 5.7 ABNORMALITIES FROM STANDARD CONDITIONS ......................................................................................... 7 5.8 ADDITIONAL INSTRUCTIONS ....................................................................................................................... 7 6 TEST INSTRUMENTS LIST ........................................................................................................................... 8 7 TEST RESULTS AND MEASUREMENT DATA .......................................................................................... 10 7.1 ANTENNA REQUIREMENT ......................................................................................................................... 10 7.2 CONDUCTED PEAK OUTPUT POWER ........................................................................................................ 11 7.3 20DB EMISSION BANDWIDTH .................................................................................................................. 12 7.4 CARRIER FREQUENCIES SEPARATION ...................................................................................................... 13 7.5 HOPPING CHANNEL NUMBER .................................................................................................................. 14 7.6 DWELL TIME ........................................................................................................................................... 15 7.7 SPURIOUS EMISSION IN NON-RESTRICTED & RESTRICTED BANDS ............................................................. 16 7.7.1 Conducted Emission Method ........................................................................................................... 16 7.7.2 Radiated Emission Method .............................................................................................................. 17 8 TEST SETUP PHOTO .................................................................................................................................. 25 9 EUT CONSTRUCTIONAL DETAILS ........................................................................................................... 2…

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Page 1 of 1 Test Model No.: DDF‐350 Radiated Emission