2A4SC-FX8PROHelmet bluetooth headset

(SHENZHEN CITYGO TECHNOLOGY CO.,LTD) (2023.06.26) 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: 2A4SC-FX8PRO) [SHENZHEN CITYGO TECHNOLOGY CO.,LTD] (“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. Sincerely, (Applicant signature) (Applicant printed name) Zhang yajun (SHENZHEN CITYGO TECHNOLOGY CO.,LTD) (2023.06.26) 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: 2A4SC-FX8PRO) [SHENZHEN CITYGO 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 as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Zhang yajun

SHENZHEN CITYGO TECHNOLOGY CO.,LTD 2023.6.26 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Helmet bluetooth headset Trademark: N/A MODEL : FX8 Pro FCC ID: 2A4SC-FX8PRO 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 - Block Diagram - Schematics - Operational Description required to be submitted with this application be permanently withheld from public review. 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. Please contact me if there is any information you may need. Sincerely, Client’s signature: Client’s name / title : Zhang yajun/Manager Contact information / address: Room 501, Building C10, Fuyuan Industrial City, No.598, Zhoushi Road, Hangcheng Street, Baoan District, Shenzhen, China

SHENZHEN CITYGO TECHNOLOGY CO.,LTD 2023.6.26 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen BCTC Testing 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, Client’s signature: Client’s name / title : Zhang yajun/Manager Contact information / address: Room 501, Building C10, Fuyuan Industrial City, No.598, Zhoushi Road, Hangcheng Street, Baoan District, Shenzhen, China

External Photos Antenna

Label & label location 10mm*5mm FCC ID:2A4SC-FX8PRO

Internal Photos

RF EXPOSURE EVALUATION METHOD FCC ID:2A4SC-FX8PRO Applicable standard： In accordance with FCC 47 CFR part 2 (2.1093) this device has been defined as a portable device which is defined as a transmitting device designed to be used so that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user. Portable devices must be evaluated using the specified in FCC 47 CFR part 2 (2.1093) and ANSI/IEEEC95.1-1992. and had been tested in accordance with the measurement methods and procedures specified in IEEE 1528-2003. Per FCC KDB 447498 D01 v06, the 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances s 50 mm are determined by: SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(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 The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. BT GFSK 2402 -3.66 21 GFSK 2441 -2.91 21 GFSK 2480 -1.33 21 π/ 4 DQPSK 2402 -1.4 21 π/ 4 DQPSK 2441 -0.75 21 π/ 4 DQPSK 2480 0.55 21 8DPSK 2402 -0.68 21 8DPSK 2441 -0.17 21 8DPSK 2480 1.1 21 max possible output power (PK,conducted)：2±1dBm 4.27dBi logarithmic terms convert to numeric result is nearly 2.673 3dBm=2.00mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2.00/5*√2.402=0.62≤3.0 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2.00/5*√2.441=0.62≤3.0 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2.00/5*√2.48=0.62≤3.0 Conclusion: 1. [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] * [√f(GHz)] < 3.0. 2. SAR Test Exclusion Thresholds is 3.0 for separation distance 5mm. Therefore, SAR test is not required.

ShenZhen City FeiMin Technology CO.,LTD. SPECIFICATION FOR APPROVED CUSTOMER: City hang PRODUCTS: Built-in 2.4G antenna PART NO: Spec.: FM-S1637-FX8 Data: CUSTOMER APPROVED BY CONFIRM CHECK APPROVE APPROVED BY VENDOR ENGINEER OPERATION STOCK DEPT. DATE REMARK:Please send us one(or copy)of this approval with stamp after accepting,other copies filed by the customer. ADD:Room 303,Building C,Hengnan one Road,Gushu community,Xixiang Street,Bao’an District,Shenzhen City Tel: 0755-23035723 Fax: 0755-23036702 E-mail: [email protected] HTTP:www.fmant.cn 目录 1. Project Information .............................................................................................................................................. 4 ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 2 1.1. Appearance and Dimensions.................................................................... 4 2. Electrical Characteristics .................................................................................. 5 2.1. Test Environment Conditions .................................................................. 5 2.2. Measurement method ............................................................................... 5 2.2.1. VSWR .................................................................................................... 5 2.2.2. Log Mag .............................................................................................. 6 2.3. Efficiency and Gain ............................................................................. 6 2.3.1. Test system ...................................................................................... 6 2.3.2. No-source test data ...................................................................... 7 2.3.3. 3D Radiation Drawing .................................................................... 7 2.3.4. directional drawing of horizontal plane .............................. 8 3. Notes ................................................................................................................. 9 4. Reliability test ................................................................................................. 10 5. Product packaging specification ..................................................................... 11 ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 3 Revision history version date condition A1 2019-11-11 First edition ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 4 1. Project Information 1.1. Appearance and Dimensions ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 5 2. Electrical Characteristics 2.1. Test Environment Conditions Temperature Ordinary Temperature (5 to 35°C) Humidity Ordinary Humidity (25 to 85% RH) 2.2. Measurement method 2.2.1. VSWR ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 6 2.2.2. Log Mag 2.3. Efficiency and Gain 2.3.1. Test system ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 7 2.3.2. No-source test data Frequency (MHz) Gain (dBi) Efficiency (%) 2400 MHz 3.98 54.63 2410 MHz 4.26 57.15 2420 MHz 4.27 56.86 2430 MHz 4.19 55.5 2440 MHz 4.07 54.17 2450 MHz 3.89 53.67 2460 MHz 3.55 52.52 2470 MHz 3.29 52.04 2480 MHz 3.17 52.36 2490 MHz 3.26 52.09 2500 MHz 3.39 53.19 2.3.3. 3D Radiation Drawing ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 8 2.3.4. directional drawing of horizontal plane ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 9 3. Notes 1. When installing, be careful not to be too close to the metal part to avoid affecting the antenna performance. 2. This antenna is only suitable for this model, and the position of the antenna cannot be changed at will. If it is used on other machines, the effect will become worse, which has nothing to do with our company. ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 10 4. Reliability test project Test methods and conditions Specifications and requirements Storage environmen t 1、Test the temperature, humidity and air pressure without specifying as follows: 1. The temperature is -30°C~+80°C 2. The relative humidity is 45%-85% 3, the air pressure is 86Kpa-106Kpa. There is no obvious change in appearance All electrical parameters are consistent with those before the test. Salt spray test Saline concentration is 50 10g/L (about 5%); PH6.5-7.2; The test temperature is 35 1°C; The corrosion time is 16H. Vibration test The vibration frequency is 10-2000-10HZ, and the amplitude is 1.52mm, 10 times in the X, Y and Z directions respectively. Drop test Fell on the board from 1M. Drawing force test Test its endurance with a push-pull tester: ≧4N. Constant temperatur e and humidity test Temperature and humidity: 40°C 2°C, 90-95% RH Duration: 4H Recovery time: 1-2H. Low and high temperatur e test Circulate between 70°C and -20°C for 5 times, and then under normal conditions for 1-2H. ANTENNA SPECIFICATION Shenzhen Feimin Technology Co.,Ltd 11 5. Product packaging specification Product name: Bluetooth antenna antenna form: shielded wire +PCB 1、Labeling requirements The inner label is 7CM long and 4CM wide The outer label is 7CM long, about 5CM 2、Packing process Job description： 1. The product __PCS is packed in PE open pockets, and the inner label is affixed to each pouch; Put the __ small bag into the big PE sealing tape bag, except the tail number and spare parts. 2. Each box contains __ large bags of products, and the boxes are sealed with adhesive tape in the shape of "I"。 3. Paste the outer label on the upper right corner of the box, and there must be no missing or wrong filling. 3、Precautions When packing the box, please pay attention to lay the antenna flat and avoid serious shaking after sealing. If the whole box is not filled, it needs to be filled with foam to avoid transportation Circumstances that caused product defects in the process。 client's name supplier Shenzhen Feimin Technology Co., Ltd. Order number ************* Material coding ************* Specification model ****** product name ******* quantity *****PCS Q…

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No.：BCTC/RF-EMC-007 Page: 1 of 79 Edition：B.0 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2306292942E Applicant: SHENZHEN CITYGO TECHNOLOGY CO.,LTD Product Name: Helmet bluetooth headset Model/Type reference: FX8 Pro Tested Date: 2023-06-12 to 2023-06-19 Issued Date: 2023-06-19 Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 2 of 79 Edition：B.0 FCC ID:2A4SC-FX8PRO The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen BCTC Testing Co., Ltd, this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. Product Name: Helmet bluetooth headset Trademark: N/A Model/Type Reference: FX8 Pro Prepared For: SHENZHEN CITYGO TECHNOLOGY CO.,LTD Address: Room 501, Building C10, Fuyuan Industrial City, No.598, Zhoushi Road, Hangcheng Street, Baoan District, Shenzhen Manufacturer: SHENZHEN CITYGO TECHNOLOGY CO.,LTD Address: Room 501, Building C10, Fuyuan Industrial City, No.598, Zhoushi Road, Hangcheng Street, Baoan District, Shenzhen Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Zhancheng, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2023-06-12 Sample tested Date: 2023-06-12 to 2023-06-19 Issue Date: 2023-06-19 Report No.: BCTC2306292942E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Kelsey Tan/ Project Handler Zero Zhou/Reviewer Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 3 of 79 Edition：B.0 Table Of Content Test Report Declaration Page 1. Version .................................................................................................................. 5 2. Test Summary ....................................................................................................... 6 3. Measurement Uncertainty ..................................................................................... 7 4. Product Information And Test Setup ..................................................................... 8 4.1 Product Information ............................................................................................... 8 4.2 Test Setup Configuration ...................................................................................... 8 4.3 Support Equipment ............................................................................................... 9 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ........................................................................................................... 10 4.6 Table Of Parameters Of Text Software Setting ................................................... 10 5. Test Facility And Test Instrument Used ............................................................... 11 5.1 Test Facility ......................................................................................................... 11 5.2 Test Instrument Used .......................................................................................... 11 6. Conducted Emissions .......................................................................................... 13 6.1 Block Diagram Of Test Setup .............................................................................. 13 6.2 Limit .................................................................................................................... 13 6.3 Test procedure .................................................................................................... 13 6.4 EUT operating Conditions ................................................................................... 13 6.5 Test Result .......................................................................................................... 14 7. Radiated emissions ............................................................................................. 16 7.1 Block Diagram Of Test Setup .............................................................................. 16 7.2 Limit .................................................................................................................... 17 7.3 Test procedure .................................................................................................... 18 7.4 EUT operating Conditions ................................................................................... 19 7.5 Test Result .......................................................................................................... 19 8. Radiated Band Emission Measurement And Restricted Bands Of Operation ..... 23 8.1 Block Diagram Of Test Setup .............................................................................. 23 8.2 Limit .................................................................................................................... 23 8.3 Test procedure .................................................................................................... 24 8.4 EUT operating Conditions ................................................................................... 24 8.5 Test Result .......................................................................................................... 25 9. Spurious RF Conducted Emissions ..................................................................... 26 9.1 Block Diagram Of Test Setup .............................................................................. 26 9.2 Limit .................................................................................................................... 26 9.3 Test procedure .................................................................................................... 26 9.4 Test Result ...................................…

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Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 62 of 79 Edition：B.0 CFS NVNT 1-DH1 2480MHz CFS NVNT 2-DH1 2402MHz Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 63 of 79 Edition：B.0 CFS NVNT 2-DH1 2441MHz CFS NVNT 2-DH1 2480MHz Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 64 of 79 Edition：B.0 CFS NVNT 3-DH1 2402MHz CFS NVNT 3-DH1 2441MHz Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 65 of 79 Edition：B.0 CFS NVNT 3-DH1 2480MHz Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 66 of 79 Edition：B.0 13. Number Of Hopping Frequency 13.1 Block Diagram Of Test Setup 13.2 Limit Frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels. 13.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 100kHz. VBW = 300kHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. It may prove necessary to break the span up to sections. in order to clearly show all of the hopping frequencies. The limit is specified in one of the subparagraphs of this Section. 4. Set the spectrum analyzer: Start Frequency = 2.4GHz, Stop Frequency = 2.4835GHz. Sweep=auto; 13.4 Test Result Condition Mode Hopping Number Limit Verdict NVNT 1-DH1 79 15 Pass NVNT 2-DH1 79 15 Pass NVNT 3-DH1 79 15 Pass Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 67 of 79 Edition：B.0 Test Graphs Hopping No. NVNT 1-DH1 2441MHz Hopping No. NVNT 2-DH1 2441MHz Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 68 of 79 Edition：B.0 Hopping No. NVNT 3-DH1 2441MHz Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 69 of 79 Edition：B.0 14. Dwell Time 14.1 Block Diagram Of Test Setup 14.2 Limit Frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels. The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. Frequency hopping systems may avoid or suppress transmissions on a particular hopping frequency provided that a minimum of 15 channels are used. 14.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set spectrum analyzer span = 0. Centred on a hopping channel; 3. Set RBW = 1MHz and VBW = 3MHz.Sweep = as necessary to capture the entire dwell time per hopping channel. Set the EUT for DH5, DH3 and DH1 packet transmitting. 4. Use the marker-delta function to determine the dwell time. If this value varies with different modes of operation (e.g.. data rate. modulation format. etc.). repeat this test for each variation. The limit is specified in one of the subparagraphs of this Section. Submit this plot(s). 14.4 Test Result DH5 Packet permit maximum 1600 / 79 / 6 hops per second in each channel (5 time slots RX, 1 time slot TX). DH3 Packet permit maximum 1600 / 79 / 4 hops per second in each channel (3 time slots RX, 1 time slot TX). DH1 Packet permit maximum 1600 / 79 /2 hops per second in each channel (1 time slot RX, 1 time slot TX). So, the Dwell Time can be calculated as follows: DH5:1600/79/6*0.4*79*(MkrDelta)/1000 DH3:1600/79/4*0.4*79*(MkrDelta)/1000 DH1:1600/79/2*0.4*79*(MkrDelta)/1000 Remark: Mkr Delta is once pulse time. Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 70 of 79 Edition：B.0 Condition Mode Frequency (MHz) Pulse Time (ms) Total Dwell Time (s) Limit (s) Verdict NVNT 1-DH1 2441 0.374 0.120 0.4 Pass NVNT 1-DH3 2441 1.629 0.261 0.4 Pass NVNT 1-DH5 2441 2.880 0.307 0.4 Pass NVNT 2-DH1 2441 0.384 0.123 0.4 Pass NVNT 2-DH3 2441 1.632 0.261 0.4 Pass NVNT 2-DH5 2441 2.885 0.308 0.4 Pass NVNT 3-DH1 2441 0.385 0.123 0.4 Pass NVNT 3-DH3 2441 1.638 0.262 0.4 Pass NVNT 3-DH5 2441 2.895 0.309 0.4 Pass Test Graphs Dwell NVNT 1-DH1 2441MHz One Burst Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 71 of 79 Edition：B.0 Dwell NVNT 1-DH3 2441MHz One Burst Dwell NVNT 1-DH5 2441MHz One Burst Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 72 of 79 Edition：B.0 Dwell NVNT 2-DH1 2441MHz One Burst Dwell NVNT 2-DH3 2441MHz One Burst Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 73 of 79 Edition：B.0 Dwell NVNT 2-DH5 2441MHz One Burst Dwell NVNT 3-DH1 2441MHz One Burst Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 74 of 79 Edition：B.0 Dwell NVNT 3-DH3 2441MHz One Burst Dwell NVNT 3-DH5 2441MHz One Burst Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 75 of 79 Edition：B.0 15. Antenna Requirement 15.1 Limit 15.203 requirement: For intentional device, according to 15.203: an intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. 15.2 Test Result The EUT antenna is External antenna, The antenna gain is 4.27dBi, and is connected in a fixed IPX manner, fulfill the requirement of this section. Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 76 of 79 Edition：B.0 16. EUT Photographs EUT Photo 1 Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 77 of 79 Edition：B.0 17. EUT Test Setup Photographs Conducted Measurement Photo Radiated Measurement Photos Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 78 of 79 Edition：B.0 Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 79 of 79 Edition：B.0 STATEMENT 1. The equipment lists are traceable to the national reference standards. 2. The test report can not be partially copied unless prior written approval is issued from our lab. 3. The test report is invalid without the "special seal for inspection and testing". 4. The test report is invalid without the signature of the approver. 5. The test process and test result is only related to the Unit Under Test. 6. Sample information is provided by the client and the laboratory is not responsible for its authenticity. 7. The quality system of our laboratory is in accordance with ISO/IEC17025. 8. If there is any objection to…

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Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 77 of 79 Edition：B.0 17. EUT Test Setup Photographs Conducted Measurement Photo Radiated Measurement Photos Report No.: BCTC2306292942E No.：BCTC/RF-EMC-007 Page: 78 of 79 Edition：B.0