2AYOC-CASTONEBone Conduction Headphones

Cast one 3 3 白燈熄滅 無線傳輸範圍10米 鋰電池 約1.5小時 約10小時 機械按鍵＋觸摸 骨傳導揚聲器 溫度 Cast one 白燈熄滅 滑動-由後往前 滑動-由前往後 觸控三下 觸控二下 紅燈每30秒亮一次 綠燈呼吸閃/綠燈熄滅 二 橘燈閃3次 Auracast廣播源切換 短按開關機鍵二次 白燈呼吸閃 藍燈呼吸閃 藍燈呼吸閃Broadcast scan 三 經典藍牙/Auracast 廣播模式切換 束口袋 Cast one V5.3 30 -26 Cast one 3 3 三 白灯熄灭 白灯熄灭 二 滑动-由后往前 触控三下 绿灯呼吸闪/绿灯熄灭 触控二下 橘灯闪3次 白灯呼吸闪 蓝灯呼吸闪 “Bluetooth mode” “Broadcast mode” 红灯每30秒亮一次 滑动-由前往后 经典蓝牙/Auracast 广播模式切换 Auracast广播源切换短按开关机键二次蓝灯呼吸闪“Broadcast scan” “Bluetooth mode” “Broadcast mode”   本產品可以進行經典藍牙模式和Auracast廣播模式的切換。開機默認 為經典藍牙模式。開關機鍵按3次即可切換到Auracast廣播模式；再 按下開關鍵3次，便再次切換回經典藍牙模式。進入Auracast廣播模 式後，可以按下開關鍵2次，做廣播源的切換。 本产品可以进行经典蓝牙模式和Auracast广播模式的切换。开机默认 为经典蓝牙模式。开关机键按3次即可切换到Auracast广播模式；再 按下开关键3次，便再次切换回经典蓝牙模式。进入Auracast广播模 式后，可以按下开关键2次，做广播源的切换。 This product allows switching between classic Bluetooth mode and Auracast broadcast mode. It defaults to classic Bluetooth mode upon power-on. Press the power button three times to switch to Auracast broadcast mode; press the power button three times again to switch back to classic Bluetooth mode. Once in Auracast broadcast mode, you can press the power button twice to switch the broadcast source. 束口袋  Bluetooth Auracast Bluetooth 3 Auracast 3 Bluetooth Auracast 2 3 3 “Power on” “Pairing” “Power off” “2 Doo” “Power on” “Pairing” “Power off” “2 Doo”                        
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Kaibo Audio Inc. Covered Equipment Certification Attestation Letter 6/23/2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID: 2AYOC-CASTONE Kaibo Audio 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. Note: If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, the applicant should include an explanation on why the equipment is not “covered” equipment. Kaibo Audio 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 a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Kaibo Audio Inc. (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Signed: Printed name: CP Lee Title: CEO Company Name: Kaibo Audio Inc. Date: 6/23/2026

Kaibo Audio Inc. U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: June 23, 2026 Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2AYOC-CASTONE Kaibo Audio Inc. (“the applicant”) certifies that, as of the date of the filing of the application, Kaibo Audio Inc. (“the agent”) is our designated U.S. agent for service of process for the above reference FCC ID. The applicant accepts to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission- related administrative or judicial proceeding involving the equipment, whichever is later. The applicant further acknowledges it is our responsibility to inform the FCC whenever the agent information changes. Kaibo Audio Inc. ("the agent) understand it is the agent's obligation to accept service of process in the United States for matters related to the applicable equipment, and at the physical U.S. address and email address. Designated U.S. Agent Company Name: Kaibo Audio Inc. FRN: 0030398077 Address: 14001 Avery Ranch Blvd. 1003 Austin Texas United States 78717 Signature: Contact Person: CP Lee Tel: 512 484 8587 Email: [email protected] Applicant Company Name: Kaibo Audio Inc. FRN: 0030398077 Address: 14001 Avery Ranch Blvd. 1003 Austin Texas United States 78717 Signature: Contact Person: CP Lee Tel: 512 484 8587 Email: [email protected]

DATE: June 23, 2026 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 Authority to Act as Agent On our behalf, I appoint Shenzhen CCUT Quality Technology Co., Ltd. (1F, Building 35, Changxing Technology Indstrl Park Changzhen Community, Yutang Street,Shenzhen,China) to act as our agent in the preparation of this application for equipment certification. I certify that submitted documents properly describe the device or system for which equipment certification is sought. I also certify that each unit manufactured, imported or marketed, as defined in the Federal Communications Commission’s regulations will have affixed to it a label identical to that submitted for approval with this application. For instances where our authorized agent signs the application for certification on our behalf, I acknowledge that all responsibility for complying with the terms and conditions for certification, still resides with Kaibo Audio Inc. (14001 Avery Ranch Blvd. 1003 Austin Texas United States 78717). <Signature> Name: CP Lee Title: CEO Company: Kaibo Audio Inc.

Date: June 23, 2026 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Compliance Testing, LLC to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). Sincerely, <Signature> Name: CP Lee Title: CEO Company: Kaibo Audio Inc.

DATE: June 23, 2026 Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2AYOC-CASTONE Product Name: Bone Conduction Headphones Request for Confidentiality Pursuant to Sections 0.457 and 0.459 of the commission’s rules, we hereby request that the following documents be held confidential: (List here the documents for which you are seeking confidentiality – for example ...) • Schematics • Block diagram • Operation description These materials contain trade secrets and proprietary information and are not customarily released to the public. The public disclosure of this information might be harmful to the company and provide unjustified benefits to our competitors. <Signature> Name: CP Lee Title: CEO Company: Kaibo Audio Inc.

Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE Annex A. EUT External Photos Model: Cast One EUT View 1 EUT View 2 Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE EUT View 3 EUT View 4 Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE EUT View 5 EUT View 6 Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE EUT View 7 EUT View 8

Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE Annex D. Label and Information FCC Label Sample Label Size: 1.5cm*1cm FCC Label Specifications Text is Black in color and is justified. Labels are printed in indelible ink on permanent adhesive backing or silk-screened onto the EUT or shall be affixed at a conspicuous location on the EUT. Where the EUT is constructed in two or more sections connected by wires and marketed together, the above statement is required to be affixed only to the main control unit. When the EUT is so small or for such use that it is not practicable to place the statement on it, the above information shall be placed in a prominent location in the instruction manual or pamphlet supplied to the user or, alternatively, shall be placed on the container in which the device is marketed. FCC Label Location

Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE Annex B. EUT Internal Photos EUT View 1 EUT View 2 Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE EUT View 3 EUT View 4 SMD ANT Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE EUT View 5

FCC ID: 2AYOC-CASTONE RF Exposure Evaluation According to KDB 447498 D01 General RF Exposure Guidance v06 and part 2.1093，Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(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 Here, The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. For BLE Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 1.91 1(±1) 2 1.58 2480 5 0.497637 3.0 For BR+EDR Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 1.73 1(±1) 2 1.58 2480 5 0.497637 3.0 So a SAR test is not required

2.4GHz 2012 Chip Antenna: RANT2012F245X07 Dimension(mm) L2.05+-0.10 W1.20+-0.10 T0.65+-0.10 No.TerminalName 1Feeding/GNG 2GND Application: WLAN,802.11b/g,Bluetooth,WLAN,etc... Features SMD,highreliability,ultraImpact,Omni-directional... PartnumberInformation RANT2012F245X07 (A)(B)(C)(D)(E)(F) (A)ProductTypeChipAntenna (B)SizeCode2.0x1.2mm(+-0.2mm) (C)MaterialHighKmaterial (D)Frequency2.4~2.5GHz (E)FeedingmodePIFA&SingleFeeding (F)AntennatypeType=07 ElectricalSpecification WorkingFrequencyRange2400~2484MHz Bandwidth84(Min.) PeakGain1.7dBi(Typ.) Impedance50Ohm Returnloss10dB(Min) PolarizationLinear AzimuthBeamwidthOmni-directional OperationTemperature( °C )-40~85 °C ResistancetoSolderingHeats 10sec.(@280°C) TerminationNi/Au(Leadless) ThespecificationisdefinedonEVB. DimensionandTerminalConfiguration 咏成國際科技有限公司電話 :13530576606 RAINInternationalTechnologyCo.,Ltd. 7/F,BuildingF,ZhichuangPark,Tong'an,Gushu,Shenzhen 2.4GHz 2012 Chip Antenna: RANT2012F245X07 EvaluationBoardReference PCBDimensionAntennaLayoutReferenceUnit:mm ElectricalCharacteristics ReturnLoss ReturnLoss&Radiation 1 Frequency(MHz) S11(dB) 2400-10.77 2450-24.81 2484-10.243 Radiation Z Y X 2400MHz2450MHz2500MHz Efficiency70.56%75.25%71.01% 2.4GHz 2012 Chip Antenna: RANT2012F245X07 TapingSpecifications ReelandTapingSpecification ReelSpecification TYPESIZEABCD 20127”5K/Reel 9.0±0.5 60±213.5±0.5178±2 TappingSpecification PackagingTypeABWEFGHTDP PaperType2012 1.50±0.202.30±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.101.57±0.104.0±0.1 ReliabilityTabl 2.4GHz 2012 Chip Antenna: RANT2012F245X07 e TestItemProcedure Requirements CeramicType Remark (Reference) Electrical Characterization Fulfilltheelectrical specification UserSpec. Thermal Shock 1.Preconditioning: 50±10°C/1hr,thenkeepfor24±1hrsatroomtemp. 2.Initialmeasure:Spec:referInitialspec. 3.Rapidchangeoftemperaturetest: -30°Cto+85°C;100cycles; 15minutesatLowercategorytemperature; 15minutesatUppercategorytemperature. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 107 Temperature Cycling 1.Initialmeasure:Spec:referInitialspec. 2.100Cycles(-30°Cto+85°C),SoakMode=1(2Cycle/hours). 3.Measurementat24±2Hoursaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. JESD22 JA104 HighTemperature Exposure 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered;500hours@T=+85°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 LowTemperature Storage 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered:500hours@T=-30°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 Solderability (SMDBottomSide) Dippingmethod: a.Temperature:235±5°C b.Dippingtime:3±0.5s Thesoldershouldcover over95%ofthecritical areaofbottomside. IEC60384-21/22 4.10 SolderingHeat Resistance (RSH) Preheatingtemperature:150±10°C. Preheatingtime:1~2min. Soldertemperature:260±5°C. Dippingtime:5±0.5s NoVisibleDamage.IEC60384-21/22 4.10 Vibration5g'sfor20min.,12cycleseachof3orientations Note:Use8"X5"PCB.031"thick7securepointson,onelong sideand2securepointsatcornersofoppositesides.Parts mountedwithin2"fromanysecurepoint.Testfrom10-2000 Hz. NoVisibleDamage.MIL-STD-202 Method204 Mechanical Shock Threeshocksineachdirectionshallbeappliedalongthethree mutuallyperpendicularaxesofthetestspecimen(18shocks) Peakvalue:1,500g’s Duration:0.5ms Velocitychange:15.4ft/s Waveform:Half-sine NoVisibleDamage.MIL-STD-202 Method213 Humidity Bias 1.Humidity:85%R.H.,Temperature:85±2°C. 2.Time:500±24hours. 3.Measurementat24±2hrsaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 Method106 2.4GHz 2012 Chip Antenna: RANT2012F245X 2.4GHz 2012 Chip Antenna: RANT2012F245X07 07 _ Board Flex (SMD) 1.Mountingmethod: IR-Reflow.PCBSize(L:100×W:40×T:1.6mm) 2.Applytheloadindirectionofthearrowuntilbendingreaches 2mm. NoVisibleDamage.AEC-Q200 005 AdhesionForceof1.8Kgfor60seconds.NoVisibleDamage Magnificationof20Xor greatermaybeemployed forinspectionofthe mechanicalintegrityofthe devicebodyterminalsand body/terminaljunction. AEC-Q200 006 Physical Dimension Anyapplicablemethodusingx10magnification,micrometers, calipers,gauges,contourprojectors,orothermeasuring equipment,capableofdeterminingtheactualspecimen dimensions. Inaccordancewith specification. JESD22 JB100 RevisionHistory RevisionDateContent 1NewDatashee2022/10/15t

Report No: DSP26040418-2E FCC Test Report Page 1 of 52 FCC TEST REPORT FCC ID: 2AYOC-CASTONE Report No. : DSP26040418-2E Applicant : Kaibo Audio Inc. Product Name : Bone Conduction Headphones Model Name : Cast One Test Standard : FCC Part 15.247 Date of Issue : 2026-04-23 Shenzhen CCUT Quality Technology Co., Ltd. 1F, Building 35, Changxing Technology Industrial Park, Yutang Street, Guangming District, Shenzhen, Guangdong, China; (Tel.:+86-755-23406590 website: www.zrlklab.com) This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd. Report No: DSP26040418-2E FCC Test Report Page 2 of 52 Test Report Basic Information Applicant..................................: Kaibo Audio Inc. Address of Applicant...............: 14001 Avery Ranch Blvd. 1003 Austin Texas United States 78717 Manufacturer..........................: WANSTONIC ELECTRONICS Address of Manufacturer........: No. 31, Tongfu West Road, Shijie Town, Dongguan, Guangdong Province, China Product Name.........................: Bone Conduction Headphones Brand Name.............................: - Main Model..............................: Cast One Series Models..........................: - Test Standard..........................: FCC Part 15 Subpart C ANSI C63.4-2014 ANSI C63.10-2020 + Cor.1-2023 Date of Test .............................: 2026-04-16 to 2026-04-23 Test Result...............................: PASS Tested By ................................: (Colin Chen) Reviewed By............................: (Lorzix Luo) Authorized Signatory............: (Lahm Peng) Note : This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd.. All test data presented in this test report is only applicable to presented test sample. Report No: DSP26040418-2E FCC Test Report Page 3 of 52 CONTENTS 1. General Information ....................................................................................................................................................5 1.1 Product Information .............................................................................................................................................5 1.2 Test Setup Information..........................................................................................................................................6 1.3 Compliance Standards ...........................................................................................................................................7 1.4 Test Facilities ........................................................................................................................................................7 1.5 List of Measurement Instruments ..........................................................................................................................8 1.6 Measurement Uncertainty .....................................................................................................................................9 2. Summary of Test Results ........................................................................................................................................... 10 3. Antenna Requirement ............................................................................................................................................... 11 3.1 Standard and Limit.............................................................................................................................................. 11 3.2 Test Result .......................................................................................................................................................... 11 4. Conducted Emissions ................................................................................................................................................ 12 4.1 Standard and Limit.............................................................................................................................................. 12 4.2 Test Procedure.................................................................................................................................................... 12 4.3 Test Data and Results .......................................................................................................................................... 13 5. Radiated Emissions ................................................................................................................................................... 16 5.1 Standard and Limit.............................................................................................................................................. 16 5.2 Test Procedure.................................................................................................................................................... 16 5.3 Test Data and Results .......................................................................................................................................... 18 6. Band-edge Emissions(Radiated) ............................................................................................................................... 22 6.1 Standard and Limit.............................................................................................................................................. 22 6.2 Test Procedure.................................................................................................................................................... 22 6.3 Test Data and Results .......................................................................................................................................... 22 7. Frequency Hopping System ..........................................................................................…

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Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE Annex C. Test Photos Radiated Emission Test View 1 Radiated Emission Test View 2 Report No: DSP26040418-1&2E FCC ID: 2AYOC-CASTONE Conducted Emission Test View 1