2BGL7TK4Helmet Bluetooth Intercom

NOTE: 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 Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the 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. Use the Helmet Bluetooth Intercom in the environment with the temperature between -10°C and 40°C, otherwise, it may damage your Product Name. It can be operating under 2000m. Hereby, (Shenzhen Yiyue Electronic Technology Co., Ltd.) declare that the radio equipment type Helmet Bluetooth Intercom is compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address: www.xxxyyy.com The product shall only be connected to a USB interface of version USB2.0 or higher and that the connection to a power USB is prohibited. Caution: For Battery: Risk of explosion battery is replaced by an incorrect type, dispose of used batteries according to the instructions. To prevent possible hearing damage, do not listen at high volume levels for long periods. Operating Frequency Range The maximum RF Output Power VHF band II: 87.5 MHz to 108 MHz (FM) / Bluetooth 2402 - 2480 MHz 3.77dBm

Shenzhen Yiyue Electronic Technology Co., Ltd. Product Similarity Declaration Product name: Helmet Bluetooth Intercom Model name: TK-X4SC, TK-X4SCP, TK-X4SCpro, X4SCpro, X4SCL, TK-X4, TK-X4P, TK-X4pro, X4pro, X4L FCC ID: 2BGL7TK4 We (Shenzhen Yiyue Electronic Technology Co., Ltd.) hereby state that all the models are electrical identical including the same software parameter and hardware design, the only difference is TK-X4SC, TK-X4SCP, TK-X4SCpro, X4SCpro, X4SCL are with screen and only with different model names. TK-X4, TK-X4P, TK-X4pro, X4pro, X4L are without screen and only with different model names. Signature: Name: JiangHui LU Title: General Manager Date: Jun. 19, 2024

Shenzhen Yiyue Electronic Technology Co., Ltd. Room 606, Building S, No. 1, Ruiji Road, Nanlian Community, Longgang Street,Longgang District,ShenzhenChina Jun. 19, 2024 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 (Attestation of Global Compliance (Shenzhen) 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, Name: JiangHui LU Title: General Manager

Report No.: AGC00688240509AP03 Page 1 of 7 EXTERNAL PHOTOS WHOLE VIEW OF EUT TOP VIEW OF EUT (Test Model: TK-X4SC) Report No.: AGC00688240509AP03 Page 2 of 7 BOTTOM VIEW OF EUT FRONT VIEW OF EUT Report No.: AGC00688240509AP03 Page 3 of 7 BACK VIEW OF EUT LEFT VIEW OF EUT Report No.: AGC00688240509AP03 Page 4 of 7 RIGHT VIEW OF EUT TOP VIEW OF EUT (Series Model(s): TK-X4) Report No.: AGC00688240509AP03 Page 5 of 7 BOTTOM VIEW OF EUT FRONT VIEW OF EUT Report No.: AGC00688240509AP03 Page 6 of 7 BACK VIEW OF EUT LEFT VIEW OF EUT Report No.: AGC00688240509AP03 Page 7 of 7 RIGHT VIEW OF EUT ****************************************End of Report*************************************

FCC ID Label Location 20mm*10mm FCC ID: 2BGL7TK4

Report No.: AGC00688240509AP03 Page 1 of 12 INTERNAL PHOTOS Test Model: TK-X4SC PORT VIEW OF EUT (FIGURE 1) PORT VIEW OF EUT (FIGURE 2) Report No.: AGC00688240509AP03 Page 2 of 12 OPEN VIEW OF EUT (FIGURE 1) OPEN VIEW OF EUT (FIGURE 2) Report No.: AGC00688240509AP03 Page 3 of 12 BATTERY VIEW OF EUT (FIGURE 1) INTERNAL VIEW OF EUT (FIGURE 1) Report No.: AGC00688240509AP03 Page 4 of 12 INTERNAL VIEW OF EUT (FIGURE 2) INTERNAL VIEW OF EUT (FIGURE 3) Report No.: AGC00688240509AP03 Page 5 of 12 INTERNAL VIEW OF EUT (FIGURE 4) INTERNAL VIEW OF EUT (FIGURE 5) Report No.: AGC00688240509AP03 Page 6 of 12 INTERNAL VIEW OF EUT (FIGURE 6) INTERNAL VIEW OF EUT (FIGURE 7) BT Antenna Report No.: AGC00688240509AP03 Page 7 of 12 INTERNAL VIEW OF EUT (FIGURE 8) Series Model(s): TK-X4 PORT VIEW OF EUT (FIGURE 1) Report No.: AGC00688240509AP03 Page 8 of 12 PORT VIEW OF EUT (FIGURE 2) OPEN VIEW OF EUT (FIGURE 1) Report No.: AGC00688240509AP03 Page 9 of 12 OPEN VIEW OF EUT (FIGURE 2) BATTERY VIEW OF EUT (FIGURE 1) Report No.: AGC00688240509AP03 Page 10 of 12 INTERNAL VIEW OF EUT (FIGURE 1) INTERNAL VIEW OF EUT (FIGURE 2) Report No.: AGC00688240509AP03 Page 11 of 12 INTERNAL VIEW OF EUT (FIGURE 3) INTERNAL VIEW OF EUT (FIGURE 4) BT Antenna Report No.: AGC00688240509AP03 Page 12 of 12 INTERNAL VIEW OF EUT (FIGURE 5) INTERNAL VIEW OF EUT (FIGURE 6) ****************************************End of Report*************************************

Page 1 of 10 RF Exposure Report Report No.: AGC00688240509FH01 FCC ID : 2BGL7TK4 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Helmet Bluetooth Intercom BRAND NAME : N/A MODEL NAME : TK-X4SC, TK-X4SCP, TK-X4SCpro, X4SCpro, X4SCL, TK-X4, TK-X4P, TK-X4pro, X4pro, X4L APPLICANT : Shenzhen Yiyue Electronic Technology Co., Ltd. DATE OF ISSUE : Jun. 07, 2024 STANDARD(S) : FCC KDB 447498 D01 V06 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC00688240509FH01 Page 2 of 10 Report Revise Record Report Version Revise Time Issued Date Valid Version Notes V1.0 / Jun. 07, 2024 Valid Initial Release Report No.: AGC00688240509FH01 Page 3 of 10 Table of Contents 1. General Information ........................................................................................................................................ 4 2. Product Information ........................................................................................................................................ 5 2.1 Product Technical Description ................................................................................................................... 5 3. Test Environment ............................................................................................................................................ 6 3.1 Address Of The Test Laboratory ............................................................................................................... 6 3.2 Test Facility ................................................................................................................................................ 6 3.3 Environmental Conditions ......................................................................................................................... 7 4. Portable Device Evaluation Method and Limit ............................................................................................. 8 5. Mobile Device Evaluation Method and Limit ................................................................................................ 9 6. Measurement Results ................................................................................................................................... 10 7. Measurement Evaluation .............................................................................................................................. 10 Report No.: AGC00688240509FH01 Page 4 of 10 1. General Information Applicant Shenzhen Yiyue Electronic Technology Co., Ltd. Address Room 606, Building S, No. 1, Ruiji Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen, China Manufacturer Shenzhen Yiyue Electronic Technology Co., Ltd. Address Room 606, Building S, No. 1, Ruiji Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen, China Factory Shenzhen Yiyue Electronic Technology Co., Ltd. Address Room 606, Building S, No. 1, Ruiji Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen, China Product Designation Helmet Bluetooth Intercom Brand Name N/A Test Model TK-X4SC Series Model(s) TK-X4SCP, TK-X4SCpro, X4SCpro, X4SCL, TK-X4, TK-X4P, TK-X4pro, X4pro, X4L Difference Description TK-X4SC, TK-X4SCP, TK-X4SCpro, X4SCpro, X4SCL are with screen and only with different model names TK-X4, TK-X4P, TK-X4pro, X4pro, X4L are without screen and only with different model names Date of receipt of test item May 22, 2024 Date of Test May 22, 2024 to Jun. 05, 2024 Deviation from Standard No any deviation from the test method Condition of Test Sample Normal Test Result Pass Test Report Form No AGCER-FCC-RF Exposure-V1 Note: The test results of this report relate only to the tested sample identified in this report. Prepared By Bibo Zhang (Project Engineer) Jun. 07, 2024 Reviewed By Calvin Liu (Reviewer) Jun. 07, 2024 Approved By Max Zhang (Authorized Officer) Jun. 07, 2024 Report No.: AGC00688240509FH01 Page 5 of 10 2. Product Information 2.1 Product Technical Description Frequency Band (Operating) WLAN: 2.412GHz ~ 2.462GHz WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz WLAN: 5.745GHz ~ 5825GHz Bluetooth: 2.402GHz ~ 2.480GHz Other: Hardware Version V1.0 Software Version V1.0 Modulation Type GFSK, π /4-DQPSK, 8DPSK Device Category Portable (<20cm separation) Mobile (>20cm separation) Others: Antenna Diversity Single antenna Multiple antennas Tx diversity Rx diversity Tx/Rx diversity Antenna Designation Chip Antenna Antenna Gain 4.3dBi Minimum Assessment Distance 5mm Evaluation Applied MPE Evaluation SAR Evaluation Report No.: AGC00688240509FH01 Page 6 of 10 3. Test Environment 3.1 Address Of The Test Laboratory Laboratory: Attestation of Global Compliance (Shenzhen) Co., Ltd. Address: 1-2/F, Building 19, Junfeng Industrial Park, Chongqing Road, Heping Community, Fuhai Street, Bao'an District, Shenzhen, Guangdong, China 3.2 Test Facility The test facility is recognized, certified, or accredited by the following organizations: CNAS-Lab Code: L5488 Attestation of Global Compliance (Shenzhen) Co., Ltd. has been assessed and proved to follow CNAS-CL01 Accreditation Criteria for Testing and Calibration Laboratories (identical to ISO/IEC17025: 2017 General Requirements for the Competence of Testing and Calibration Laboratories.) A2LA-Lab Cert. No.: 5054.02 Attestation of Global Compliance (Shenzhen) Co., Ltd. EMC Laboratory has been accredited by A2LA for technical competence in the field of electrical testing, and proved to follow ISO/IEC 17025: 2017 General Requirements for the Competence of Testing and Calibration Laboratories and any additional program requirements in the identified field of testing. FCC-Registration No.: 975832 Attestation of Global Compliance (Shenzhen) Co., Ltd. EMC Laboratory has been registered and fully described in a report filed with the FCC (Federal Communications Commission). The acceptance letter from the FCC is maintained in our files with Registration 975832. IC-Registration No.: 24842(CAB identifier: CN0063)…

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Approval sheet CA-C03_V01 1 APPROVAL SHEET CrossAir TM SMD Antenna series RoHS Compliance PN: CA-C03 2.4 GHz ISM band antenna Approval sheet CA-C03_V01 2 FEATURES 1. Surface Mounted Devices (SMD) with a small dimension of 5.5 X 2.0 X 1.0 mm 3 meet miniaturization trend. 2. Low power loss and high antenna efficiency. 3. High stability in Temperature and Humidity Change. APPLICATIONS 1. 2.4GHz ISM band RF applications 2. Bluetooth,ZigBee, Wireless, HomeRF 3. WIFI（2.4G only） CONSTRUCTION 1、Antenna Feeding 2、Identification Mark 3、Soldering terminal DIMENSIONS Figure Symbol Dimension(mm) L 5.5±0.1 w 2.0±0.1 T 1.0±0.1 a 0.5±0.1 Approval sheet CA-C03_V01 3 ELECTRICAL CHARACTERISTICS CA-C03 Specification Working Frequency Range 2450±50MHz Fc(GHz) 2.7GHz Band Width >100MHz Impedance 50Ω Gain(dBi) 4.3（peak） VSWR <2 Operation Temperature -40°C~+95°C Power Capacity 3W The working frequency need be adjusted to 2.45GHz with matching circuit. SOLDER LAND PATTERN DESIGN Figure Approval sheet CA-C03_V01 4 Matching component value Series 1 0Ω Shunt 1 3nh Series 2 0Ω Antenna on Test Board (Thickness 1.0mm) Approval sheet CA-C03_V01 5 Antenna S11 on Test Board Antenna VSWR on Test Board Efficiency and RADIATION PATTERN Efficiency，Radiation Pattern and Gain were dependent on measurement board design. The Approval sheet CA-C03_V01 6 specification of CA-C03 antenna was measured based on the PCB size and installation position as shown in the below figure test board. The test results were tested in ETS 3D Chamber. Gain and Efficiency 2.4G-2.5GHz Peak Gain 4.3dBi Average Gain across the band 4.1dBi Gain Range across the band 3.9dBi~4.3dBi Peak Efficiency 81.7% Average Efficiency across the band 80.2% Efficiency Range across the band 78.6%~81.7% Theta @2.45 GHz Phi @2.45 GHz Z Y X Approval sheet CA-C03_V01 7 Total @2.45 GHz SOLDERING CONDITION Typical examples of soldering processes that provide reliable joints without any damage is as follows: Approval sheet CA-C03_V01 8 PACKAGING Plastic Tape specification (unit:mm) Index Ao Bo ΦD T W Dimension (mm) 3.0±0.1 6.0±0.1 1.55±0.05 1.2±0.1 11.8±0.1 Index E F Po P1 P2 Dimension (mm) 1.75±0.1 4.6±0.1 4.0±0.1 4.0±0.1 2.0±0.1 Reel dimensions Index A B C Dimension(mm) 178 60 13.5 Typing Quantity: 3000 pieces per reel. CAUTION OF HANDLING Storage environment condition Products shoud be storage in the warehouse on the following conditions: Approval sheet CA-C03_V01 9 Temperature : -10°C~+40°C Humidity : 30% to 70% relative humidity Don’t keep products in corrosive gases such as sulfur. Chlorine gas or acid or it may cause oxidization of electrode, resulting in poor solderability. Products should be storage on the palette for the prevention of the influence from humidity, dust and so on. Products should be storage in the warehouse without heat shock, vibration, direct sunlight and so on. Products should be storage under the airtight packaged condition.

Page 1 of 81 FCC Test Report Report No.: AGC00688240509FR01 FCC ID : 2BGL7TK4 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Helmet Bluetooth Intercom BRAND NAME : N/A MODEL NAME : TK-X4SC, TK-X4SCP, TK-X4SCpro, X4SCpro, X4SCL, TK-X4, TK-X4P, TK-X4pro, X4pro, X4L APPLICANT : Shenzhen Yiyue Electronic Technology Co., Ltd. DATE OF ISSUE : Jun. 07, 2024 STANDARD(S) : FCC Part 15 Subpart C §15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC00688240509FR01 Page 2 of 81 Report Revise Record Report Version Revise Time Issued Date Valid Version Notes V1.0 / Jun. 07, 2024 Valid Initial Release Report No.: AGC00688240509FR01 Page 3 of 81 Table of Contents 1. General Information ........................................................................................................................................ 5 2. Product Information ........................................................................................................................................ 6 2.1 Product Technical Description ................................................................................................................... 6 2.2 Test Frequency List ................................................................................................................................... 6 2.3 Related Submittal(S) / Grant (S) ............................................................................................................... 7 2.4 Test Methodology ...................................................................................................................................... 7 2.5 Receiver Input Bandwidth ......................................................................................................................... 7 2.6 Equally Average Use of Frequencies And Behaviour ............................................................................... 7 2.7 Pseudorandom Frequency Hopping Sequence ........................................................................................ 8 2.8 Special Accessories .................................................................................................................................. 9 2.9 Equipment Modifications ........................................................................................................................... 9 2.10 Antenna Requirement ............................................................................................................................. 9 3. Test Environment .......................................................................................................................................... 10 3.1 Address of The Test Laboratory .............................................................................................................. 10 3.2 Test Facility .............................................................................................................................................. 10 3.3 Environmental Conditions ....................................................................................................................... 11 3.4 Measurement Uncertainty ....................................................................................................................... 11 3.5 List of Equipment Used ........................................................................................................................... 12 4.System Test Configuration ............................................................................................................................ 14 4.1 EUT Configuration ................................................................................................................................... 14 4.2 EUT Exercise ........................................................................................................................................... 14 4.3 Configuration of Tested System .............................................................................................................. 14 4.4 Equipment Used in Tested System ......................................................................................................... 14 4.5 Summary of Test Results ........................................................................................................................ 15 5. Description of Test Modes ........................................................................................................................... 16 6. RF Output Power Measurement .................................................................................................................. 17 6.1 Provisions Applicable .............................................................................................................................. 17 6.2 Measurement Procedure ......................................................................................................................... 17 6.3 Measurement Setup (Block Diagram of Configuration) .......................................................................... 17 6.4 Measurement Result ............................................................................................................................... 18 7. 20dB Bandwidth and 99% Occupied Bandwidth Measurement ............................................................... 19 7.1 Provisions Applicable .............................................................................................................................. 24 7.2 Measurement Procedure ......................................................................................................................... 24 7.3 Measurement Setup (Block Diagram of Configuration) .......................................................................... 24 7.4 Measurement Results ...................................................................................................................…

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Report No.: AGC00688240509AP02 Page 1 of 3 TEST SETUP PHOTOS RADIATED EMISSION TEST SETUP BELOW 1GHz-Test Model: TK-X4SC RADIATED EMISSION TEST SETUP ABOVE 1GHz-Test Model: TK-X4SC Report No.: AGC00688240509AP02 Page 2 of 3 RADIATED EMISSION TEST SETUP BELOW 1GHz-Series Model(s): TK-X4 RADIATED EMISSION TEST SETUP ABOVE 1GHz-Series Model(s): TK-X4 Report No.: AGC00688240509AP02 Page 3 of 3 AC POWER LINE CONDUCTED TEST SETUP RF CONDUCTED TEST SETUP ****************************************End of Report*************************************