2AC76-HEROSmart watch

Covered Equipment Attestation Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Section 2.911(d)(5)(i)-(ii) of the Commission’s Rules (47 C.F.R.) we attest as follows for the product listed below: FCC ID Model name 2AC76-HERO Cubitt HERO GEN4 We, Applicant Company Name: DIGILINK GROUP CO., LTD. Address: 3th Floor, Block B3, HengFeng Industrial Park, Bao'an District, Shenzhen, China Phone: +86-755-28174512 certify 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. This includes the cybersecurity and anti-virus software produced or provided by Kaspersky Lab, Inc. or any of ist successors and assignees. We certify 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. If you have any questions, please feel free to contact us at the address shown below. Sincerely, 2026-04-21 Signature Date Name / Title: Becky Zhong / Manager Company: DIGILINK GROUP CO., LTD. Address: 3th Floor, Block B3, HengFeng Industrial Park, Bao'an District, Shenzhen, China Phone: +86-755-28174512 Fax: N/A E-Mail: [email protected]

Due Diligence Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern FCC ID Model name 2AC76-HERO Cubitt HERO GEN4 Pursuant to KDB 986446 D01 Covered Equipment Guidance the evaluation of the product above shows compliance for the following reasons: Compliance Evaluation process Results Inherent compliance The chipset(s) used is not capable of running the cybersecurity and/or anti-virus software Compliance The memory used does not allow the running the cybersecurity and/or anti-virus software Compliance The storage capacity does not allow the running the cybersecurity and/or anti-virus software Compliance The operating system used is not capable of running the cybersecurity and/or anti-virus software Compliance No inherent compliance Based on software bill of material Based on scan for running software on the device Based on filesystem scan for cybersecurity and/or anti-virus software The equipment for which authorization is sought complies with the rules and fulfils the requirements as detailed in the above mentioned KDB. Evaluation performed by Company Name: Shenzhen Huaxia Testing Technology Co., Ltd Contact Name: Yoyo Zhou Address: 1F., Block A of Tongsheng Technology Building, Huahui Road, Dalang Street, Longhua District, Shenzhen, China Phone: +86-755-26648642 Email: [email protected] Signature: Date: 2025-04-10

Confidentiality Request Letter For Certification Service in the USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Paragraphs §0.457 and 0.459 of the Commission’s Rules (47 C.F.R.) and Section §552(b)(4) of the Freedom of Information Act, we request confidentiality for the documentation of the following products: FCC ID Model name 2AC76-HERO Cubitt HERO GEN4 For the products listed above, we request permanent confidentiality for all applicable exhibits as there are: • the Operational Description • the Block Diagram • the Schematics • the Part List • the Tune up Information The above listed exhibits contain trade secrets and proprietary information that could be of benefit to our competitors. If you have any questions, please feel free to contact us at the address shown below. Sincerely, 2026-04-21 Signature Date Name / Title: Becky Zhong / Manager Company: DIGILINK GROUP CO., LTD. Address: 3th Floor, Block B3, HengFeng Industrial Park, Bao'an District, Shenzhen, China Phone: +86-755-28174512 Fax: N/A E-Mail: [email protected]

Externalphotos FCC ID: 2AC76-HERO

Internalphotos FCC ID: 2AC76-HERO Antenna

ShenzhenHuaxiaTestingTechnologyCo.,Ltd. SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD102A,102B,Building2,ShanghenglangNew IndustrialZone,ShanghenglangCommunity,DalangStreet,LonghuaDistrict,Shenzhen,Guangdong, People’sRepublicofChina,518000 Telephone:+86-755-26648640 Fax:+86-755-26648637 Website:www.cqa-cert.com ReportTemplateVersion:V04 ReportTemplateRevisionDate:2018-07-06 TESTREPORT Thetestreportiseffectiveonlywithbothsignatureandspecializedstamp,Theresult(s)showninthisreportreferonlytothe sample(s)tested.WithoutwrittenapprovalofCQA,thisreportcan’tbereproducedexceptinfull. ReportNo.: CQASZ20260300432E-03 Applicant:DIGILINKGROUPCO.,LTD. AddressofApplicant: 3thFloor,BlockB3,HengFengIndustrialPark,Baoandistrict,ShenZhen, China EquipmentUnderTest(EUT): EUTName: Smartwatch ModelNo.: CubittHEROGEN4 TestModelNo.: CubittHEROGEN4 BrandName: Cubitt FCCID: 2AC76-HERO Standards: 47CFRPart1.1307 47CFRPart1.1310 KDB447498D01GeneralRFExposureGuidancev06 DateofReceipt:2026-03-04 DateofTest: 2026-03-04to2026-03-12 DateofIssue: 2026-4-10 TestResult:PASS TestedBy: (LewisZhou) ReviewedBy: (TimoLei) ApprovedBy: (JackAi) ShenzhenHuaxiaTestingTechnologyCo.,Ltd ReportNo.:CQASZ20260300432E-03 Page: 2 of 8 1.Version RevisionHistoryOfReport ReportNo.Version Description IssueDate CQASZ20260300432E-03Rev.01 Initialreport 2026-4-10 ShenzhenHuaxiaTestingTechnologyCo.,Ltd ReportNo.:CQASZ20260300432E-03 Page: 3 of 8 2.Contents 1.VERSION....................................................................................................................................................................................2 2.CONTENTS................................................................................................................................................................................3 3.GENERALINFORMATION....................................................................................................................................................4 4.CLIENTINFORMATION........................................................................................................................................................4 5.GENERALDESCRIPTIONOFEUT......................................................................................................................................4 6.GENERALDESCRIPTIONOFBLE......................................................................................................................................4 7.GENERALDESCRIPTIONOFBLE......................................................................................................................................4 RFEXPOSUREEVALUATION..................................................................................................................................................6 RFEXPOSURECOMPLIANCEREQUIREMENT.............................................................................................................................6 StandardRequirement........................................................................................................................................................6 Limits......................................................................................................................................................................................6 EUTRFExposure................................................................................................................................................................7 ShenzhenHuaxiaTestingTechnologyCo.,Ltd ReportNo.:CQASZ20260300432E-03 Page: 4 of 8 3.GeneralInformation 4.ClientInformation Applicant: DIGILINKGROUPCO.,LTD. AddressofApplicant: 3thFloor,BlockB3,HengFengIndustrialPark,Baoandistrict,ShenZhen, China Manufacturer: DIGILINKGROUPCO.,LTD. AddressofManufacturer: 3thFloor,BlockB3,HengFengIndustrialPark,Baoandistrict,ShenZhen, China Factory: DIGILINKGROUPCO.,LTD. AddressofFactory: 3thFloor,BlockB3,HengFengIndustrialPark,Baoandistrict,ShenZhen, China 5.GeneralDescriptionofEUT ProductName: Smartwatch ModelNo.: CubittHEROGEN4 TestModelNo.: CubittHEROGEN4 TradeMark: Cubitt SoftwareVersion: 911A-T9372-100 HardwareVersion: T9372V1.0 PowerSupply: Li-ionbatteryDC3.8V200mAh,ChargebyDC5Vforadapter SimultaneousTransmissionSimultaneousTXissupportedandevaluatedinthisreport. SimultaneousTXisnotsupported. 6.GeneralDescriptionofBLE OperationFrequency:2402MHz~2480MHz ModulationType:GFSK TransferRate:1Mbps/2Mbps NumberofChannel:40 Modulemodel:Ap2t21f40E ProductType:MobilePortable AntennaType: Chipantenna AntennaGain: 4.3dBi 7.GeneralDescriptionofBLE OperationFrequency:2402MHz~2480MHz ModulationType:GFSK TransferRate:1Mbps/2Mbps NumberofChannel:40 Modulemodel:RTL8773EWE ProductType:MobilePortable ShenzhenHuaxiaTestingTechnologyCo.,Ltd ReportNo.:CQASZ20260300432E-03 Page: 5 of 8 AntennaType: internalantenna AntennaGain: -7.13Bi ShenzhenHuaxiaTestingTechnologyCo.,Ltd ReportNo.:CQASZ20260300432E-03 Page: 6 of 8 RFExposureEvaluation RFExposureComplianceRequirement StandardRequirement AccordingtoKDB447498D01GeneralRFExposureGuidancev06 4.3.1.StandaloneSARtestexclusionconsiderations UnlessspecificallyrequiredbythepublishedRFexposureKDBprocedures,standalone1- gheadorbodyand10-gextremitySARevaluationforgeneralpopulationexposure conditions,bymeasurementornumericalsimulation,isnotrequiredwhenthe correspondingSARExclusionThresholdcondition,listedbelow,issatisfied. Limits The1-gand10-gSARtestexclusionthresholdsfor100MHzto6GHzattestseparation distances≤50mmaredeterminedby: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistance, mm)]·[√f(GHz)]≤3.0for1-gSARand≤7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation17 Theresultisroundedtoonedecimalplaceforcomparison Thetestexclusionsareapplicableonlywhentheminimumtestseparationdistanceis≤50mm andfortransmissionfrequenciesbetween100MHzand6GHz.Whentheminimumtest separationdistanceis<5mm,adistanceof5mmisappliedtodetermi…

Text truncated - open the document above for the full version.

CA-C03_V0 CA-C03 Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 1 SMD Antenna Specifications CrossAir TM SMD Antenna Series Compliant with RoHS Specifications PN:CA-C03 2.4 GHz ISM Band antenna Address: Room 1119, Building 1 Hongda Commercial and Creative Park 96 Yuanxiang Road Yunpu Subdistrict Huangpu District Guangzhou City CA-C03_V0 CA-C03Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 2 Characteristics 1. Compact SMD patch antenna measuring just 5.5 × 2.0 × 1.0 mm³ 2. Low energy dissipation with high antenna efficiency 3. High stability under varying temperature and humidity conditions 1.2.4GHz ISM Band Antenna Applications 2. Bluetooth, ZigBee, wireless applications, smart home applications, etc. Application 3. Wi-Fi (2.4GHz only) Structure 1. Antenna feed end 2. Feed identification mark 3. Antenna soldered fixing end Dimensions Three-view drawings symbol Dimensions(mm) L 5.5±0.2 w 2.0±0.1 T 1.0±0.1 a 0.5±0.1 CA-C03_V0 CA-C03Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 3 Electrical characteristics CA-C03 Specification 2450±50 Working Frequency MHz > Band Width 100MHz 50 Impedance Ω 4.3（peak Gain(dBi) ） < VSWR 2 -40°C~+95 Operation Temperature °C 3 Power Capacity W The antenna's 2.4 GHz operating frequency requires tuning via impedance matching components. Antenna Pad and Trace Design PCB schematic diagram Design dimension drawing Radio frequency signals CA-C03_V0 CA-C03Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 4 Matching device values Series device Series1 resistor 0Ω Parallel device Shunt 1 High-frequency inductor 3nh Series device Series 2 resistance 0Ω CA-C03_V0 CA-C03Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 5 Antenna testing on test board (board thickness 1.0mm) Antenna S11 Specifications Antenna VSWR Characteristics CA-C03_V0 CA-C03Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 6 Efficiency and Radiation Pattern Performance characteristics such as efficiency, radiation pattern, and gain are derived from the test board design. The specification test data for the CA-C03 antenna is based on the dimensions of the test PCB board and the test direction shown in the diagram below. The following data was obtained during testing in an ETS 3D microwave anechoic chamber. Gain and efficiency bandwidth 2.4G-2.5GHz 4.3d PeakGain Bi Average Gainacross the band 4.1dBi Gain Range across the band 3.9dBi~4.3dBi 8 Peak Efficiency 1.7% AverageEfficiency across the band 80.2% Efficiency Range across the band 78.6%~81.7% Z Y X CA-C03_V0 CA-C03Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 7 Theta @2.45 GHz Phi @2.45 GHz Total @2.45 GHz Welding conditions A typical reliable and non-destructive welding specification is illustrated below: CA-C03_V0 CA-C03 Specification Guangzhou Cambrian Electronics Technology Co., Ltd. 2 8 Packaging Plastic carrier tape specifications (unit: mm) CA-C03Specification CA-C03_V0 Guangzhou Cambrian Electronics Technology Co., Ltd. 2 9 Index Ao Bo ΦD T W Dimension (mm) 3.0±0.1 6.0±0.1 1.55±0.05 1.6±0.1 16±0.2 Index E F Po P1 P2 Dimension (mm) 1.75±0.1 7.0±0.1 4.0±0.1 4.0±0.1 2.0±0.1 Reel dimensions Index A B C Dimension(mm) 330 100 13.5 Standard quantity: 3000 pieces per tray. Storage environment Products shall be stored under the following conditions: Temperature Humidity : -10°C~+40°C : 30% to 70% relative humidity The product must not be placed in locations where it may come into contact with corrosive gases such as sulphur. Chlorine gas or acids may cause oxidation of the product's electrodes, resulting in impaired solderability. The product should be stored in a toolbox and protected from moisture and dust. The product should be stored in a warehouse, shielded from heat, vibration, and direct sunlight. The product must be stored in sealed conditions. Dongguan Guchuang Electronic Technology Co., Ltd. 。。 AddressRoom 902, Building 7, Times Zhirui Technology No. 159 Sanlian Road, Luwu Changping Town Dongguan City Guangdong Province, China Model: 2.4GHz PCB ANT Notesforantennainstallation Length Notesforantennainstallation Electronicwireinstallationrecommendations: 1:Theelectronlinelengthisinthe24.60mm. 2:Theelectronicwireisinstalledonthesideofthehorn. 3:Theendoftheelectronicwireisfixedwithadhesive papertomaketheconsistencyofthebatchproductiongood. Antennaparameters Freq2.4GHz2.5GHzspce VSWR1.481.79 ＜ 2 LogMag-14.15-10.93 ＜ -10 Antennaparameters Frequency/MhzEfficiency / %Gain/dBi 24004.2-7.13 24104.21-7.3 24204.33-7.43 24304.38-7.69 24404.4-7.9 24504.66-7.84 24604.8-7.75 24705.01-7.56 24804.7-7.7 24904.65-7.62 25004.29-7.99 Themeasureddistanceontheroofofthebuilding Project T11-N Testdate 2024.5.9 Software release Testlocation Themeasureddistanceontheroofofthe building Model Measuringdistance Metalwatchband Non-metallic watchband IOS Positiveeffective distance (≥15m) 1817 Backeffectivedistance (≥10m) 106 Android Positiveeffective distance (≥15m) 1818 Backeffectivedistance (≥10m) 99 Thank You! The Concepts National Income And National Product Have Roughly The Same Value And Can Be Used Interchangeably If Our Interest Is In Their

SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD 102A,102B,Building2,ShanghenglangNewIndustrialZone,ShanghenglangCommunity, DalangStreet,LonghuaDistrict,Shenzhen,Guangdong,People’sRepublicofChina,518000 Telephone:+86-755-26648640 Fax:+86-755-26648637 Website:www.cqa-cert.com ReportTemplateVersion:V06 ReportTemplateRevisionDate:2026-01-30 TestReport Thetestreportiseffectiveonlywithbothsignatureandspecializedstamp,Theresult(s)showninthisreportreferonly tothesample(s)tested.WithoutwrittenapprovalofCQA,thisreportcan’tbereproducedexceptinfull. ReportNo.:CQASZ20260300432E-01 Applicant:DIGILINKGROUPCO.,LTD. AddressofApplicant: 3thFloor,BlockB3,HengFengIndustrialPark,Baoandistrict,ShenZhen, China EquipmentUnderTest(EUT): Product: Smartwatch ModelNo.: CubittHEROGEN4 TestModelNo.: CubittHEROGEN4 BrandName: Cubitt FCCID: 2AC76-HERO Standards:47CFRPart15,SubpartC KDB558074D0115.247MeasGuidancev05r02 ANSIC63.10:2020 DateofReceipt:2026-03-04 DateofTest: 2026-03-04to2026-03-12 DateofIssue:2026-4-10 TestResult:PASS* *Intheconfigurationtested,theEUTcompliedwiththestandardsspecifiedabove. TestedBy: (LewisZhou) ReviewedBy: (TimoLei) ApprovedBy: (JackAi) SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD ReportNo.:CQASZ20260300432E-01 Page: 2 of 62 1Version RevisionHistoryOfReport ReportNo.Version Description IssueDate CQASZ20260300432E-01Rev.01Initialreport2026-4-10 SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD ReportNo.:CQASZ20260300432E-01 Page: 3 of 62 2TestSummary TestItemTestRequirementTestmethodResult AntennaRequirement 47CFRPart15,SubpartCSection 15.203/15.247(c) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS ACPowerLine Conducted Emission 47CFRPart15,SubpartCSection 15.207 ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS ConductedPeakOutput Power 47CFRPart15,SubpartCSection 15.247(b)(3) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS 6dBOccupied Bandwidth 47CFRPart15,SubpartCSection 15.247(a)(2) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS PowerSpectralDensity 47CFRPart15,SubpartCSection 15.247(e) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS Band-edgeforRF ConductedEmissions 47CFRPart15,SubpartCSection 15.247(d) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS RFConductedSpurious Emissions 47CFRPart15,SubpartCSection 15.247(d) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS RadiatedSpurious Emissions 47CFRPart15,SubpartCSection 15.205/15.209 ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS Restrictedbandsaround fundamentalfrequency (RadiatedEmission) 47CFRPart15,SubpartCSection 15.205/15.209 ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD ReportNo.:CQASZ20260300432E-01 Page: 4 of 62 3Contents Page 1VERSION..........................................................................................................................................................................2 2TESTSUMMARY............................................................................................................................................................3 3CONTENTS......................................................................................................................................................................4 4GENERALINFORMATION...........................................................................................................................................5 4.1CLIENTINFORMATION.................................................................................................................................................5 4.2GENERALDESCRIPTIONOFEUT.................................................................................................................................5 4.3ADDITIONALINSTRUCTIONS........................................................................................................................................7 4.4TESTENVIRONMENT...................................................................................................................................................8 4.5DESCRIPTIONOFSUPPORTUNITS...............................................................................................................................8 4.6TESTCONFIGURATION................................................................................................................................................8 4.7STATEMENTOFTHEMEASUREMENTUNCERTAINTY....................................................................................................9 4.8TESTLOCATION........................................................................................................................................................10 4.9TESTFACILITY..........................................................................................................................................................10 4.10DEVIATIONFROMSTANDARDS................................................................................................................................10 4.11OTHERINFORMATIONREQUESTEDBYTHECUSTOMER..........................................................................................10 4.12EQUIPMENTLIST.....................................................................................................................................................11 5TESTRESULTSANDMEASUREMENTDATA.....................................................................................................12 5.1ANTENNAREQUIREMENT..........................................................................................................................................12 5.2CONDUCTEDEMISSIONS............................................................................................................................................13 5.3CONDUCTEDPEAKOUTPUTPOWER...........................................................…

Text truncated - open the document above for the full version.