2AOTUKDDY139control box

Rev 2026-04-24 (CHANGZHOU KAIDI ELECTRICAL INC) Fe deral Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date : 08-17-2026 Ref: Attestation Statements Part 2.911(d)(5)(i) and Part 2.911(d)(5)(ii) FCC ID: 2AOTUKDDY139 Part 2.911(d)(5)(i) [CHANGZHOU KAIDI ELECTRICAL INC] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment and does not contain anti-virus software or cybersecurity software prohibited from receiving an equipment authorization pursuant to 47 CFR 2.903, KDB 986446 D01 Co vered Equipment Guidance , and FCC Covered List (www.fcc.gov/supplychain/coveredlist). Part 2.911(d) (5)(ii) [CHANGZHOU KAIDI ELECTRICAL INC] (“the applicant”) certifies that, as o f 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” eq uipment. Sincerely, Qin Yin/Manager CHANGZHOU KAIDI ELECTRICAL INC

CHANGZHOU KAIDI ELECTRICAL INC U.S. Agent Designation for Service of Process - Certification Attestation Letter 17/08/2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Ref: Attestation Statements Part 2.911(d)(7) Filing FCC ID: 2AOTUKDDY139 ApplicantFRN: 0027151182 CHANGZHOU KAIDI ELECTRICAL INC certifies that, as of the date of the filing of the application, KaidiLLC. is our designated U.S. agent for service of process for the above referenced FCC ID. CHANGZHOU KAIDI ELECTRICAL INCaccepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Kaidi LLC. accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent Information: Company Name:KaidiLLC. FCC Registration Number (FRN):TheagentforserviceofprocessdoesnootherbusinesswiththeFCCand doesnothaveanFRN. Physical U.S. Company Address: 131LuckyStarDr,Baldwyn,Ms38824 Contact Person:BrittanyPhillips Cell Phone: (662)601-7325 Agent Email Address: [email protected] Sincerely, Company: CHANGZHOU KAIDI ELECTRICAL INC Designated Agent: KaidiLLC. Company Representative: Qin Yin/Manager Designated Agent Representative: BrittanyPhillips Title: GeneralManager Title: General Manager Signature:Signature:

(CHANGZHOU KAIDI ELECTRICAL INC) Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2AOTUKDDY139 Pursuant to Secti ons 0.457 and 0.4 59 of t he Commission’s Rules, we hereby request confidential treatment of inf ormation accompanying this application as outli ne d below: Exhibit Type File Name Block diagram, Schematic, Operational Description Block diagram.pdf, Schematic.pdf , Operational Description.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Pursuant to DA04-1705 June 15, 2004 of the Commission’s public notice, we also request temporary confidential treatment of information accompanying this application as outlined below: Short-term confidentiality requested: 180 days Exhibit Type File Name Internal photos, Test setup photos, User Manual Internal photos.pdf, Test setup photos.pdf, User Manual.pdf Sincerely, Qin Yin/Manager 2026.08.17 CHANGZHOU KAIDI ELECTRICAL INC

(CHANGZHOU KAIDI ELECTRICAL INC) Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Date: August 17, 2026 SUBJECT: FCC Application for FCC ID: 2AOTUKDDY139 To Whom It May Concern: We, the undersigned, hereby authorize Tony Wei at EMTEK(NINGBO) CO., LTD. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by EMTEK(NINGBO) CO., LTD. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the applicat ion is subject to a denial of f ederal benefits pursuant to that section. Regards, Qin Yin/Manager CHANGZHOU KAIDI ELECTRICAL INC

FCC ID: 2AOTUKDDY139 RF EXPOSURE EVALUATION According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency(RF) Radiation as specified in §1.1307(b) Limits for Maximum Permissible Exposure (MPE) Frequency Range(MHz) Electric Field Strength(V/m) Magnetic Field Strength(A/m) Power Density(mW/cm 2 ) Average Time (A) Limits for Occupational/Control Exposures 300-1500 -- -- F/300 6 1500-100000 -- -- 5 6 (B) Limits for General Population/Uncontrol Exposures 300-1500 -- -- F/1500 6 1500-100000 -- -- 1 30 11.1 Friis transmission formula: Pd= (Pout*G)\ (4*pi*R 2 ) Where Pd= Power density in mW/cm 2 Pout=output power to antenna in mW G= Numeric gain of the antenna relative to isotropic antenna Pi=3.1416 R= distance between observation point and center of the radiator in cm Pd the limit of MPE,1mW/cm 2 . If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. mW = 10^( dBm/10) 11.2 Measurement Result Antenna gain: 2.27 dBi; R=20cm GFSK Operation Frequency: 2402 MHz-2480 MHz; Channel Freq. (MHz) modulation Measured power (dBm) Tune-up power (dBm) Max tune-up power (dBm) Antenna Gain Numeric Evaluation result (mW/cm2) Power density Limits (mW/cm2 ) 2402 GFSK/1Mbps -1.46 -2.00±1 -1.00 1.69 0.000239734 1 2440 -0.70 -1.00±1 0.00 1.69 0.000285581 1 2480 -0.57 -1.00±1 0.00 1.69 0.000294259 1 *** End of Report ***

Report No. ENB2606050120W00601R Page 1 of 52 Ver.1.0 TEST REPORT Product Name : control box Model Number : KDDY139 FCC ID : 2AOTUKDDY139 Prepared for : CHANGZHOU KAIDI ELECTRICAL INC Address : JiangCun, Henglin Town, Changzhou City, Jiangsu Province, China Prepared by : EMTEK (NINGBO) CO., LTD. Address : No. 8, Building 8, Lane 216, Qingyi Road, Ningbo High-Tech Zone, Ningbo, Zhejiang, China Tel: +86-574-27907998 Fax: +86-574-27721538 Report Number : ENB2606050120W00601R Date(s) of Tests : June 05, 2026 to July 22, 2026 Date of issue : July 23, 2026 $二维码$ Report No. ENB2606050120W00601R Page 2 of 52 Ver.1.0 Table of Contents 1 TEST RESULT CERTIFICATION ..................................................................................................................... 3 2 EUT TECHNICAL DESCRIPTION ................................................................................................................... 5 3 SUMMARY OF TEST RESULT ......................................................................................................................... 6 4 TEST METHODOLOGY .................................................................................................................................... 7 4.1 GENERAL DESCRIPTION OF APPLIED STANDARDS ............................................................................. 7 4.2 MEASUREMENT EQUIPMENT USED ........................................................................................................ 7 4.3 DESCRIPTION OF TEST MODES ................................................................................................................. 9 5 FACILITIES AND ACCREDITATIONS ......................................................................................................... 10 5.1 FACILITIES .................................................................................................................................................. 10 5.2 EQUIPMENT ................................................................................................................................................ 10 5.3 LABORATORY ACCREDITATIONS AND LISTINGS ............................................................................... 10 6 TEST SYSTEM UNCERTAINTY ...................................................................................................................... 11 7 SETUP OF EQUIPMENT UNDER TEST ........................................................................................................ 12 7.1 RADIO FREQUENCY TEST SETUP 1 ........................................................................................................ 12 7.2 RADIO FREQUENCY TEST SETUP 2 ........................................................................................................ 12 7.3 CONDUCTED EMISSION TEST SETUP .................................................................................................... 15 7.4 BLOCK DIAGRAM CONFIGURATION OF TEST SYSTEM .................................................................... 16 7.5 SUPPORT EQUIPMENT .............................................................................................................................. 16 8 TEST REQUIREMENTS .................................................................................................................................. 17 8.1 DTS 6DB BANDWIDTH .............................................................................................................................. 17 8.2 DTS 99%BANDWIDTH ............................................................................................................................... 19 8.3 MAXIMUM PEAK CONDUCTED OUTPUT POWER ............................................................................... 21 8.4 MAXIMUM POWER SPECTRAL DENSITY .............................................................................................. 23 8.5 UNWANTED EMISSIONS IN NON-RESTRICTED FREQUENCY BANDS ............................................ 25 8.6 RADIATED SPURIOUS EMISSION ............................................................................................................ 31 8.7 CONDUCTED EMISSIONS TEST ............................................................................................................... 49 8.8 ANTENNA APPLICATION .......................................................................................................................... 52 Report No. ENB2606050120W00601R Page 3 of 52 Ver.1.0 1 TEST RESULT CERTIFICATION Applicant : CHANGZHOU KAIDI ELECTRICAL INC Address : JiangCun, Henglin Town, Changzhou City, Jiangsu Province, China Manufacturer : CHANGZHOU KAIDI ELECTRICAL INC Address : JiangCun, Henglin Town, Changzhou City, Jiangsu Province, China EUT : control box Model Name : KDDY139 Trademark : N/A Measurement Procedure Used: APPLICABLE STANDARDS STANDARD TEST RESULT FCC 47 CFR Part 2, Subpart J FCC 47 CFR Part 15, Subpart C PASS The above equipment was tested by EMTEK(NINGBO) CO., LTD. The test data, data evaluation, test procedures, and equipment configurations shown in this report were made in accordance with the procedures given in ANSI C63.10 (2020) and the energy emitted by the sample EUT tested as described in this report is in compliance with the requirements of FCC Rules Part 2, Part 15.247. The test results of this report relate only to the tested sample identified in this report. Date of Test : June 05, 2026 to July 22, 2026 Prepared by : WK Luo /Engineer Reviewer : June Gao /Supervisor Approved & Authorized Signer : Tony Wei /Manager Report No. ENB2606050120W00601R Page 4 of 52 Ver.1.0 Modified History Version Report No. Revision Date Summary / ENB2606050120W00601R / Original Report Report No. ENB2606050120W00601R Page 5 of 52 Ver.1.0 2 EUT TECHNICAL DESCRIPTION Characteristics Description Product: control box Model Number: KDDY139 Test Sample S/N: ENB2606050120W006-1-1 Data Rate : 1Mbps Modulation: GFSK Operating Frequency…

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SPECIFICATIONS Frequency（MHz）2400-2480 Peak Gain（dBi）2.27 Average Gain（dBi）＞0 VSWR＜1.9 Impedance（Ω）50Ω Antenna TypePlannar Inverted F on board PolarizationLinear Z X Y Test Environment: Zhongke Guoji Darkroom Testing System 2.4G-2.48G Band On-Board PIFA Antenna Test Report Manufacture：‌ZhuHai JieLi Technology Co.,Ltd Adress：No.333 Kexing Road, Xiangzhou District, Zhuhai City Passive S-parameters of antenna： Standing Wave Ratio (VSWR), Return Loss, and Smith Chart Frequency（MHz）Gain（dBi）Effciency（%）AverageGain（dBi）Efficiency（dB） 24001.4863.36%-2.73-1.98 24101.2557.22%-3.40-2.43 24200.6054.48%-3.43-2.64 2430-0.0648.04%-3.91-3.18 2440-0.0945.16%-4.20-3.45 24500.3649.24%-3.56-3.08 24601.0854.75%-3.10-2.62 24701.5554.67%-2.97-2.62 24802.2764.19%-2.25-1.93 Average0.9454.57%-3.28-2.66 Peak2.2764.19%-2.25-1.93 2Antenna400MHz2D-ThetaPattern Antenna efficiency and gain 2Antenna440MHz2D-ThetaPattern 2Antenna480MHz2D-ThetaPattern 2Antenna400MHz2D-PhiPattern 2Antenna440MHz2D-PhiPattern 2Antenna480MHz2D-PhiPattern 2Antenna400MHz3D-TotalPattern 2Antenna440MHz3D-TotalPattern 2Antenna480MHz3D-TotalPattern