2BUIP-MC4ROOKIE ROOKIE GOLF SENSOR

shelton international,inc. 21, Jong-ro 44-gil, Jongno-gu, Seoul, Republic of Korea Date: January 20, 2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (FCC ID: 2BUIP-MC4) [shelton international,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. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, DONG HA KIM/DIRECTOR shelton international,inc. 21, Jong-ro 44-gil, Jongno-gu, Seoul, Republic of Korea Date: January 20, 2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (FCC ID: 2BUIP-MC4) [shelton international,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 an entity producing “covered” equipment. Sincerely, DONG HA KIM/DIRECTOR

Federal Communicaons Commission Authorizaon and Evaluaon Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 05/02/2026 Ref: A esta on Statement Part 2.911(d)(7) Filing FCC ID: 2BUIP-MC4 shelton internaonal,inc. cerfies that, as of the dates of this applicaon, Americas Compliance Consulng LLC dba iCerfi is our designated U.S. agent for service of process for the above referenced FCC ID. Manufacturer accepts to maintain an agent for no less than two year aer the grantee has terminated all marke ng and importaon or the conclusion of any commission-related proceeding involving the equipment. iCerfi accepts, as of the date of the filing of the applicaon, the obligaon of the designated U.S. agent for service process for the above referenced FCC ID. Designated U.S. Agent Informaon: Name: Americas Compliance Consulng LLC dba iCerfi FCC FRN: 0033399411 Address: 5809 US-2, Suite B, Albeni Plaza Priest River, Idaho 83856, United States Contact Person: Paul Preston Tel: +1 (866) 885-4575 Email: fccagent@icerfi.com Sincerely, shelton internaonal,inc.Americas Compliance Consulng LLC dba iCerfi FRN: 0037900750FRN: 0033399411 DONG HA KIMPaul Preston [email protected]@icerfi.com +82-2-741-1100+1 (866) 885-4575 Signature: Signature:

shelton international,inc. 21, Jong-ro 44-gil, Jongno-gu, Seoul, Republic of Korea Date: January 20, 2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (ROOKIE ROOKIE GOLF SE NSOR/ROOKIE MC4/FCC ID: 2BUIP-MC4) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the (below list) required to be submitted with this application be permanently withheld from public review. Permanent Confidential Request -. Schematics -. Block Diagram -. Operational Description SPECIFY REASON FOR REQUEST (i.e. the above documents are company proprietary information that could never get into the possession of your competition). Please contact me if there is any information you may need. Sincerely, DONG HA KIM/DIRECTOR

shelton international,inc. 21, Jong-ro 44-gil, Jongno-gu, Seoul, Republic of Korea Date: January 20, 2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 R E: CONFIDENTIALITY REQUEST FOR (ROOKIE ROOKIE GOLF SENSOR/ROOKIE MC4/FCC ID:2BUIP-MC4) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the (below list) required to be submitted with this application be short-term Confidentiality for a period of 180 days after grant is issued. Short-Term Confidential Request -. External Photos -. Internal Photos -. Test set-up photo -. User Manual SPECIFY REASON FOR REQUEST (i.e. These documents contain detailed system and equipment descriptions and related information about the product, which we considers to be proprietary, confidential, and a custom design and otherwise, would not release to the general public. Since this design is a basis from which future technological products will evolve, we feel that this information would be of benefit to our competitors, and that the disclosure of the information in these documents would give our competitors an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, DONG HA KIM/DIRECTOR

shelton international,inc. 21, Jong-ro 44-gil, Jongno-gu, Seoul, Republic of Korea Date: January 20, 2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Ms. Chloe Lee/Deputy General Manager of Eurofins KCTL Co.,Ltd. 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). This agreement expires one year from the current date. Sincerely, DONG HA KIM/DIRECTOR

[Gift Box] SHELTON INTERNATIONAL, INC. ROOKIE ROOKIEGOLF SENSOR/ ROOKIE MC4 FCC ID: 2BUIP-MC4

This test report shall not be reproduced, except in full, without the written approval * RF Exposure FCC ID: 2BUIP-MC4 1. Regulation According to the KDB 447498 D01 V06, the following RF exposure evaluation shall to demonstrate RF exposure compliance. 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. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions. The minimum test separation distance defined in 4.1 f) is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander. To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified, typically in the SAR measurement or SAR analysis report, by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting are required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions; for example, handheld PTT two-way radios, handsets, laptops and tablets, etc. a) For 100 ㎒ to 6 ㎓ and test separation distances ≤ 50 ㎜, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, ㎽) / (min. test separation distance, ㎜)] · [√f(㎓)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR,30 where ● f(㎓) is the RF channel transmit frequency in ㎓ ● Power and distance are rounded to the nearest ㎽ and mm before calculation ● The result is rounded to one decimal place for comparison ● The values 3.0 and 7.5 are referred to as numeric thresholds in step b) below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 ㎜, and for transmission frequencies between 100 ㎒ and 6 ㎓. When the minimum test separation distance is < 5 ㎜, a distance of 5 ㎜ according to 4.1 f) is applied to determine SAR test exclusion. b) For 100 ㎒ to 6 ㎓ and test separation distances > 50 ㎜, the 1-g and 10-g SAR test exclusion thresholds are determined by the following (also illustrated in Appendix B): 1) {[Power allowed at numeric threshold for 50 ㎜ in step a)] + [(test separation distance – 50 ㎜)·(f(㎒)/150)]} ㎽, for 100 ㎒ to 1500 ㎒ 2) {[Power allowed at numeric threshold for 50 ㎜ in step a)] + [(test separation distance – 50 ㎜)·10]} ㎽, for > 1500 ㎒ and ≤ 6 ㎓ c) For frequencies below 100 ㎒, the following may be considered for SAR test exclusion (also illustrated This test report shall not be reproduced, except in full, without the written approval in Appendix C): 1) For test separation distances > 50 ㎜ and < 200 ㎜, the power threshold at the corresponding test separation distance at 100 ㎒ in step b) is multiplied by [1 + log(100/f(㎒))] 2) For test separation distances ≤ 50 ㎜, the power threshold determined by the equation in c) 1) for 50 ㎜ and 100 ㎒ is multiplied by ½ 3) SAR measurement procedures are not established below 100 ㎒. When SAR test exclusion cannot be applied, a KDB inquiry is required to determine SAR evaluation requirements for any SAR test results below 100 ㎒ to be acceptable. 2. Result 2-1. Calculation Result of RF Exposure Mode Test frequency [㎒] Max. tune-up Power [㏈m] Max. tune-up Power [㎽/] Min. test separation distance [㎜] SAR test exclusion thresholds ≤ 3.0 for 1-g SAR Bluetooth Low Energy (1 Mbps) 2 402 0.00 1.00 5.00 0.31 Note: 1. SAR test exclusion thresholds = [(max. power of channel, including tune-up tolerance, ㎽)/(min. test separation distance, ㎜)] · [√f(㎓)] 3. RF Exposure Compliance Issue Therefore, EUT is not required the SAR Evaluation.

ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 1 / 11 APPROVAL SHEET MC4 Bluetooth Chip ANTENNA CUSTOMER Boo-Ree Multimedia Inc. MODEL MC4 Bluetooth Chip Antenna ANTENNA TYPE Ceramic Chip ANTENNA ANTENNA MAKER KDT DOCUMENT REVISION Rev 1.1 CUSTOMER CODE PART NAME Bluetooth ANT/ MC4,BT_Ceramic Chip,REV1,KDT Name Date Sign RF Engineer H.W Jung 26’ 03. 10 ME Engineer H.S Cho 26’ 03. 10 Development Team Manager Q.A Team Manager Operation Manager Customer 26’ 03. 10 Hwaseong R&D Center 413ho, 121, Dongtan-daero 23-gil, Hwaseong-si, Gyeonggi-do Republic of Korea 18468 ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 2 / 11 TOP BOTTOM PRODUCT PHOTO ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 3 / 11 PRODUCT SPECIFICATION MC4 Bluetooth Chip ANTENNA  Written by Name Date Sign RF Engineer H.W Jung 26’ 03. 10 ME Engineer H.S Cho 26’ 03. 10 ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 4 / 11 CONTENTS Page 1. Description ----------------------------------------------------------------------------------------------------- 5/11 2. Product Drawing ---------------------------------------------------------------------------------------------- 6/11 3. PART – LIST----------------------------------------------------------------------------------------------------- 6/11 4. Technical characteristics -------------------------------------------------------------------------------------- 7/11 5. Electrical test environment (condition/method) ----------------------------------------------------------- 8/11 6. Electrical specification ---------------------------------------------------------------------------------------- 10/11 7. 3D GAIN DATA ------------------------------------------------------------------------------------------------- 11/11 ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 5 / 11 1. Description Revision History Revision Date Description Rev 1.0 Rev 1.1 26’ 01. 13 26’ 03. 10 Rev 1.0 Approval sheet written. Rev 1.1 Added radiation pattern ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 6 / 11 2. Product Drawing 3. PART – LIST - N/A ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 7 / 11 4. Technical characteristics 4-1. Electrical characteristic(Frequency Band & Passive Spec.) Mode Set – Antenna Frequency 2400.00MHz 2450.00MHz 2500.00MHz VSWR Spec. Max. 7.8:1 Max. 2.7:1 Max. 7.7:1 3D Gain Spec Min. Peak -3.00 Min. Peak 1.80 Min. -Peak 3.60 - Marker (Setting frequency) is applied based on the VSWR value of the Master Sample because there are variations depending on the equipment, environment, and Jig. 4-2. Mechanical characteristic DIMENSION 3.2mm X 1.6mm X 1.1(H) mm ANTENNA – BASE Ceramic ANTENNA – PATTERN Ag WEIGHT 0.03g OPERATING TEMP 20 ± 5 °C OPERATING HUMIDITY 55 ± 15 % ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 8 / 11 5. Electrical test environment (condition/method) 5-1. VSWR - Step 1. Connect sample with measurement cable to network analyzer - Step 2. Set the Network analyzer to match the target frequency - Step 3. Measure VSWR 5-2. Radiation pattern & GAIN - Step 1. Calibrate the chamber system using the reference antenna Set the frequency band to measure the software to control the chamber system - Step 2. Mounting the antenna to be measure - Step 3. Measure gain, efficiency and radiation pattern. ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 9 / 11 5-3. Normal Spec. INPEDANCE 50 ohm RADIATION PATTERN Omni – Directional POLARIZATION Linear POWER HANDLING 2W MATCHING CIRCUIT Circuit reference 5-4. Matching Circuit ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 10 / 11 6. Electrical specification 6-1. VSWR – Set ANTENNA APPROVAL SHEET Customer Model Customer Code Date Document Revision Boo-Ree Multimedia Inc. MC4 26’ 03. 10 Rev 1.1 PAGE 11 / 11 7. 3D GAIN DATA 7-1 Efficiency 7-2 Radiation Pattern <2.4GHz> <2.45GHz> <2.5GHz>

verify No.828111528367 Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-4904-0113 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR26-SRF0011 Page (2) of (31) KCTL-TIR001-003/7 (220705) KP25-08757 REPORT REVISION HISTORY Date Revision Page No 2026-02-26 Originally issued - This report shall not be reproduced except in full, without the written approval of Eurofins KCTL Co.,Ltd. This document may be altered or revised by Eurofins KCTL Co.,Ltd. personnel only, and shall be noted in the revision section of the document. Any alteration of this document not carried out by Eurofins KCTL Co.,Ltd. will constitute fraud and shall nullify the document. This test report is a general report that does not use the KOLAS accreditation mark and is not related to KS Q ISO/IEC 17025 and KOLAS accreditation. General remarks for test reports Statement concerning the uncertainty of the measurement systems used for the tests (may be required by the product standard or client) Internal procedure used for type testing through which traceability of the measuring uncertainty has been established: Procedure number, issue date and title: Calculations leading to the reported values are on file with the testing laboratory that conducted the testing. Statement not required by the standard or client used for type testing Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-4904-0113 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR26-SRF0011 Page (3) of (31) KCTL-TIR001-003/7 (220705) KP25-08757 CONTENTS 1. General information ...................................................................................................... 4 2. Device information ........................................................................................................ 4 2.1. Frequency/channel operations ................................................................................ 5 2.2. RF power setting in TEST SW ................................................................................ 5 2.3. Duty Cycle Factor ................................................................................................... 5 3. Antenna requirement .................................................................................................... 6 4. Summary of tests .......................................................................................................... 7 5. Measurement uncertainty ............................................................................................. 8 6. Measurement results explanation example .................................................................. 9 7. Test results ................................................................................................................. 10 7.1. Maximum peak output power ................................................................................ 10 7.2. Peak Power Spectral Density ............................................................................... 13 7.3. 6 dB Bandwidth(DTS Channel Bandwidth) ........................................................... 15 7.4. Spurious Emission, Band Edge and Restricted bands .......................................... 17 7.5. Conducted Spurious Emission .............................................................................. 29 8. Measurement equipment ............................................................................................ 31 Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-4904-0113 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR26-SRF0011 Page (4) of (31) KCTL-TIR001-003/7 (220705) KP25-08757 1. General information Client : shelton international,inc. Address : 21, Jong-ro 44-gil, Jongno-gu, Seoul, Republic of Korea Manufacturer : Boo-Ree Multimedia Inc. Address : Room1418, 260, Songpa-daero, Songpa-gu, Seoul, Republic of Korea 05719 Laboratory : Eurofins KCTL Co.,Ltd. Address : 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea Accreditations : FCC Site Designation No: KR0040, FCC Site Registration No: 687132 VCCI Registration No. : R-20080, G-20078, C-20059, T-20056 CAB Identifier: KR0040 ISED Number: 8035A KOLAS No.: KT231 2. Device information Equipment under test : ROOKIE ROOKIE GOLF SENSOR Model : ROOKIE MC4 Modulation technique : Bluetooth Low Energy : GFSK Number of channels : 40 ch Power source : DC 3.7 V Antenna specification : Chip Antenna Antenna gain : 3.08 ㏈i Frequency range : 2 402 ㎒ ~ 2 480 ㎒ Software version : Version 2 Hardware version : Version 2 Test device serial No. : Conducted: 4d:64:00:00:08:00 Radiated: 4d:64:00:00:08:01 Operation temperature : -20 °C ~ 50 °C Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-4904-0113 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR26-SRF0011 Page (5) of (31) KCTL-TIR001-003/7 (220705) KP25-08757 2.1. Frequency/channel operations This device contains the following capabilities: Bluetooth Low Energy Ch. Frequency (㎒) 00 2 402 . . . . 17 2 440 . . . . 39 2 480 Table 2.1.1. Bluetooth Low Energy(1Mbps) 2.2. RF power setting in TEST SW Operation mode Test Program Test mode Power Setting Bluetooth Low Energy FCC_Cert 1 Mbps 0 2.3. Duty Cycle Factor Test mode Period (ms) On time (ms) Duty cycle Duty Cycle Factor (dB) (Linear) (%) 1M Bits/s, 37 Packet 10.502 6 10.404 0 0.990 6 99.06 0.04 Notes. 1. Duty cycle (Linear) = Ton time / Period 2. DCF(Duty cycle factor) = 10log(1/duty cycle) 3. DCF is not compensated to average result if the duty cycle is more than 98% 1M Bits/s, 37 Packet Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-4904-0113 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR26-SRF0011 Page (6) of (31) KCTL-TIR001-003/7 (220705) KP25-08757 3. Antenna requirement Requirement of FCC part section 15.203: An intentional radiator shall be design…

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