2AIN7JAMBUDDY-IIMINI BLUETOOTH AMPLIFIER PEDAL FOR GUITAR

FCC warning statements: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. The device has been evaluated to meet general RF exposure requirement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.

JOYO TECHNOLOGY CO., LTD 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China Attestation Statements Not Covered Entity Applicant & Not Covered Equipment To: Federal Communications Commission Date: Dec. 25, 25 7435 Oakland Mills Road, Columbia, MD 21046, USA Ref: Information Required by Section 2.911(d)(5)(i) & (ii) FCC ID: 2AIN7JAMBUDDY-II JOYO TECHNOLOGY CO., LTD (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List, established pursuant to § 1.50002 of reference chapter, as an entity producing “covered” communication equipment. The equipment for which authorization is sought is not “covered” telecommunications equipment and video surveillance equipment produced by entities identified on the Commission’s Covered List that prohibited from receiving an equipment authorization pursuant to section § 2.903 of the FCC rules. Sincerely yours, Signature: December 25, 2025 Name Qunchao Li Position manager Company Name JOYO TECHNOLOGY CO., LTD Address 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China Tel (86) 755-23120925 Fax (86) 755-29765389 Email [email protected]

JOYO TECHNOLOGY CO., LTD 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China 1 | P a g e Attestation Statements To: Federal Communications Commission Date: Dec. 25, 25 7435 Oakland Mills Road, Columbia, MD 21046, USA Subject: Attestation of Compliance with FCC Covered List Software Requirements FCC ID: [2AIN7JAMBUDDY-II] Product Name: [MINI BLUETOOTH AMPLIFIER PEDAL FOR GUITAR] This letter serves as an attestation that the equipment identified above ☐ is / ☒ is not (select one) "covered" software as defined under the Federal Communications Commission (FCC) Covered List requirements, as outlined in FCC 22-84 and KDB 986446. Specifically, the undersigned certifies that the equipment for which authorization is sought: 1. Does not contain cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors, assignees, parents, subsidiaries, affiliates, or any entity that has rebranded or relabeled software produced by the aforementioned entities. 2. Does not have the capability to store, run, or deliver any software identified on the FCC Covered List, including but not limited to cybersecurity and anti-virus software. To support this attestation, the appendix evaluation documentation has been prepared and is included in the certification filing. This attestation is based on a thorough evaluation of the device's design, functionality, and software environment. The undersigned affirms that the information provided is accurate and complete to the best of their knowledge. Sincerely yours, Applicant Signature Name Qunchao Li Position manager Company Name JOYO TECHNOLOGY CO., LTD Address 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China Tel (86) 755-23120925 Fax (86) 755-29765389 Email [email protected] JOYO TECHNOLOGY CO., LTD 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China 2 | P a g e Evaluation regarding to the Covered List Software: Compliance Methodology Evaluation Process Results Device is Inherent compliance ☒ The Chipset(s) used is limited to run the Cybersecurity or anti-virus software. Compliance ☒ The Memory used is limited to run the Cybersecurity or anti-virus software. Compliance ☒ There is storage capacity limitation for store or install the Cybersecurity or anti-virus software. Compliance ☒ Operating system used is limited to run, install or deliver the Cybersecurity or anti-virus software. Compliance Device is not Inherent compliance ☐ Evaluation Based on Software Bill of Materials (SBoM) See attached “SBoM“ Note:The SBoM content is limited to the scope of covered list software (e.g. antivirus and cybersecurity software). ☐ Evaluation Based on Scan for Software on the device ☐ Evaluation Based on Filesystem scan ☐ Evaluation Based on Running software check

1/1 USAgentforServiceofProcessLETTEROFATTESTATION TO: OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USAgentforServiceofProcess: Companyname:HOPEKCORPORATIONINC FRN:0034562900 ContactName:PeterDavis Address:16755CoyoteBushDrUnit84,SanDiego,CA92127UnitedStates TelephoneNo:561-235-6113 Email:[email protected] Applicant: Companyname:JOYOTECHNOLOGYCO.,LTD GranteeCode:2AIN7 FCCID:2AIN7JAMBUDDY-II FRN:0025629551 ContactName:QunchaoLi Address:2/F,LushiIndustryBuilding,28thDistrict,Bao’an,Shenzhen,518101 China TelephoneNo:(86)755-23120925 FaxNo:(86)755-29765389 Email:[email protected] JOYOTECHNOLOGYCO.,LTDcertifiesthat,asofthedateofthisfilingoftheapplicationwith theTCB,[HOPEKCORPORATIONINC]isourdesignatedUSagentforserviceofprocessfor theabovereferencedFCCID.JOYOTECHNOLOGYCO.,LTDacceptstomaintainanagent fornolessthanoneyearafterthegranteehasterminatedallmarketingandimportationorthe conclusionofanycommissionrelatedproceedinginvolvingequipment.[HOPEK CORPORATIONINC]accepts,asofthedateofthefilingoftheapplication,theobligationofthe designatedUSagentforserviceofprocessfortheabovereferenceFCCID. TheUSAgentforServiceofProcessisawareofandagreestocomplywiththerequirements outlinedintheFCCEquipmentAuthorizationProgram,ReportandOrderFCC22-84,and clause§2.911. TheApplicantisawareofandagreestocomplywiththerequirementsoutlinedintheFCC EquipmentAuthorizationProgram,ReportandOrderFCC22-84,andclause§2.911. Date:2025-12-23 Applicant’sName:QunchaoLiUSAgent’sName:PeterDavis Title:managerTitle:Manager Signature:Signature:

JOYO TECHNOLOGY CO., LTD 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China December 25, 2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request for: FCC ID: 2AIN7JAMBUDDY-II Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request permanent confidential treatment of the exhibits accompanying this certification application as outlined below :  Block Diagram  Schematics  Operational Description The above exhibits contain trade secrets and/or proprietary information that are not publicly available and materials that the Applicant has spent considerable efforts in developing. Public disclosure of these may be harmful to the Applicant and give an unfair advantage to competitors on the market. Sincerely, Signature: December 25, 2025 Name Qunchao Li Position manager Company Name JOYO TECHNOLOGY CO., LTD Address 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China Tel (86) 755-23120925 Fax (86) 755-29765389 Email [email protected]

JOYO TECHNOLOGY CO., LTD 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China December 25, 2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization for FCC ID: 2AIN7JAMBUDDY-II I, the undersigned, hereby authorize (Shenzhen PSI Testing Co., Ltd.) to act on our behalf in all matters relating to this application for equipment certification. Any act carried out by (Shenzhen PSI Testing Co., Ltd.) shall have the same effect as our own and I acknowledge that all responsibility for complying with the terms and conditions of certification, as specified by DERYCOM CERTIFICATION SERVICES, INC., still resides with (JOYO TECHNOLOGY CO., LTD). We certify that we are not subject to a denial of federal benefits that includes FCC benefits pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. §862, and that no party to the application, as defined in 47 CFR §1.2002(b), is subject to a denial of federal benefits that includes FCC benefits pursuant to that section. Sincerely, Signature: December 25, 2025 Name Qunchao Li Position manager Company Name JOYO TECHNOLOGY CO., LTD Address 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China Tel (86) 755-23120925 Fax (86) 755-29765389 Email [email protected]

Page 1 of 5 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Appendix II external photos FCC ID: 2AIN7JAMBUDDY-II Page 2 of 5 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 3 of 5 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 4 of 5 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 5 of 5 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China ------End------

Label and Location Material: Silk-screen Font color: White Size: L: 8cm*W: 5.1cm Label and Location FCC ID: 2AIN7JAMBUDDY-II Model No.: JAM BUDDY II

Page 1 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Appendix III internal photos FCC ID: 2AIN7JAMBUDDY-II Page 2 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 3 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 4 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 5 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 6 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 7 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 8 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China ANT BT Page 9 of 9 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China ------End------

Page 1 of 2 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Appendix IV MPE FCC ID: 2AIN7JAMBUDDY-II Prediction of MPE at a given distance 1. Limits 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) KDB Test Methodology: KDB 447498 D01 v06. 2. Test Procedure Equation from page 18 of OET Bulletin 65, Edition 97-01 Where: S = power density P = power input to the antenna G = numeric gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to the centre of radiation of the antenna Page 2 of 2 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China 3. Result Mode Frequency (MHz) Prediction distance (cm) RF output power(Max) (dBm) Tune-up power (Max) MPE (mW/cm 2 ) Limit (mW/cm 2 ) SAR Test Exclusion dBm mW BT EDR 2402-2480 20 2.50 3 1.9953 0.0006 1 Yes BT Antenna: max gain 1.9dBi, 1.55(numeric) Therefore this device complies with FCC's RF radiation exposure limits for general population without SAR evaluation.

Product specification Quick Reference Date Antenna module on the system board Frequenc Range 2400 ~ 2500MHz Ant. Port Input Pwr. (dBm) 0 (Typ. BT class 2 output power) Tot. Rad. Pwr. (dBm) -1.2 (Input pwr – loss pwr) Peak EIRP(dBm) 1.2 Directivity (dBi) 1 (all direction antenna) Efficiency (dB) 6 0.2 % Gain (dBi) 1.2 (Avg Gain XY-plane) Maximum Power (dBm) 1.7 (XY-plane) Minimum Power (dBm) -4(XY-plane) Avg. Power (dBm) -0.5(XY-plane) Input Impendence(ohm) 50 Polarization Type V ertical & Horizontal V . S .W . R < 1.4 All the technical data and information contained herein are subject to change without prior notice Antenna Layout & module on the system board Antenna Gain Gain Table Unit in dBi @2.44GHz XY-plane XZ-plane YZ-plane Efficiency Peak Avg. Peak Avg. Peak Avg. Module Board 1.2 -0.5 1.9 -3.6 1.1 -3.0 6 0.2 % Retum Loss The Environment of Antenna Radiation Pattem 3D radiation pattern diagram XY-plane XZ-plane YZ-plane

Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Page 1 of 85 Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China FCC TEST REPORT FCC ID: 2AIN7JAMBUDDY-II On Behalf of JOYO TECHNOLOGY CO., LTD MINI BLUETOOTH AMPLIFIER PEDAL FOR GUITAR Model No.: JAM BUDDY II Prepared for : JOYO TECHNOLOGY CO., LTD Address : 2/F, Lushi Industry Building, 28th District, Bao’an, Shenzhen, 518101 China Prepared By : Shenzhen PSI Testing Co., Ltd. Address : 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Report Number : psi2510101-C01-R04 Date of Receipt : December 4, 2025 Date of Test : December 4, 2025–December 12, 2025 Date of Report : December 12, 2025 Version Number : V0 Page 2 of 85 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China TABLE OF CONTENTS Description Page 1. Summary Of Standards And Results ........................................................................................ 6 1.1. Description of Standards and Results.................................................................................. 6 2. General Information .................................................................................................................. 7 2.1. Description of Device (EUT) ................................................................................................ 7 2.2. Accessories of Device (EUT) .............................................................................................. 8 2.3. Tested Supporting System Details....................................................................................... 8 2.4. Block Diagram of Connection Between EUT and Simulators ............................................... 8 2.5. Test Mode Description ........................................................................................................ 9 2.6. Software test version and power setting information ............................................................ 9 2.7. Test Conditions ................................................................................................................. 10 2.8. Test Facility ...................................................................................................................... 10 2.9. Measurement Uncertainty ................................................................................................. 10 2.10. Test Equipment List ...........................................................................................................11 3. Maximum Peak Output Power ..................................................................................................12 3.1. Limit ................................................................................................................................. 12 3.2. Test Procedure ................................................................................................................. 12 3.3. Test Setup ........................................................................................................................ 12 3.4. Test Result ....................................................................................................................... 13 4. Bandwidth .................................................................................................................................14 4.1. Limit ................................................................................................................................. 14 4.2. Test Procedure ................................................................................................................. 14 4.3. Test Setup ........................................................................................................................ 15 4.4. Test Result ....................................................................................................................... 15 5. Carrier Frequency Separation ..................................................................................................25 5.1. Limit ................................................................................................................................. 25 5.2. Test Procedure ................................................................................................................. 25 5.3. Test Setup ........................................................................................................................ 25 5.4. Test Result ....................................................................................................................... 26 6. Number Of Hopping Channel ...................................................................................................28 6.1. Limit ................................................................................................................................. 28 6.2. Test Procedure ................................................................................................................. 28 6.3. Test Setup ........................................................................................................................ 28 6.4. Test Result ....................................................................................................................... 29 7. Dwell Time ................................................................................................................................31 7.1. Test limit ........................................................................................................................... 31 7.2. Test Procedure .....…

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Page 1 of 2 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Appendix I Test Setup Photo FCC ID: 2AIN7JAMBUDDY-II Spurious Radiation Emissions Test (<1G) Spurious Radiation Emissions Test (＞1G) Page 2 of 2 Report No.: psi2510101-C01-R04 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Conducted emission Test RF conducted Test ------End------