2BBKP-055SFAshared writing board

Shared writing board user Guide Please read this Guide carefully before using this product Product Introduction: The product frame is made of metal, on the front is the writing face, the back is painted iron sheet, the upper side has an antenna base, and the side with a magnetic power interface. The shared writing board has functions such as whiteboard pen writing, touching, synchronous saving of writing content, and multi-terminal display. Its biggest feature is that on the basis of not changing the original guest habits and product appearance, the function of instant storage of writing content and multi- terminal display is added. 1: The guest's original habits unchanged: Whiteboard pen input 2: Instant storage: The written content can be synchronized to a computer or mobile phone, stored instantly, the files are not easy to lose, easy to trace. 3: Multi-terminal display: Writing can be synchronized to the projection screen or AIO, so that more participants can see it during meetings. 4: Fully wireless design. 5: While the whiteboard writing content is erased, the computer content is also erased too. Item 1: How to use 1: Make sure the antenna is connected. 2: Connect DC 5V（4.95~5.1V) power supply. 3: Plug the "receiver" into the computer (Windows system). 4: The whiteboard and the computer should be in the same open space, without walls, screens and other intervals in between. Item 2: Power supply selection 1: The working voltage of the product is 5V(4.95~5.10V) DC power supply. 2: It is recommended to use power bank as a power option. 3: If you use a charging adapter, it is recommended to use an adapter above 5V/2A, it is best to choose one brand mobile phone adapter and the AC power needs to be grounded. Item 3: Whiteboard pen selection 1: It is recommended to use the whiteboard pen provided by the supplier. 2: If you buy it yourself, it is recommended to choose a whiteboard pen in red with a nib diameter of 6 mm. 3: When writing, try to write neatly. Item 4: Anomaly analysis The whiteboard can be written normally, and the computer does not display it accordingly 1: Check whether the whiteboard power supply is normal. 2: Check whether the antenna is loose. 3: Close the application and open it again. 4: Check whether the computer recognizes the receiver and reinsert the receiver. Item 5: Attention 1: Ensure that the product is stable and does not shake during use. 2: Please use normally at room temperature. 3: Do not scratch the surface of the whiteboard by sharp objects. 4: The product is strictly forbidden to soak in water. 5: Ensure that there is not conductive objects on the writing surface during use. 6: Try to cut off the power supply during non-use. 7: In order to ensure the use effect, it is recommended to use the whiteboard pen provided by the supplier. 8: If the surface is dirty, you can use whiteboard cleaner to clean the whiteboard surface. Item 6: Accessories NO name QTY remark 1 whiteboard pen 2 receiver 3 power cable 4 antenna 5 Whiteboard bracket Item 7: Other 1: In order to ensure the use effect, as far as possible to use the pen provided by the supplier. 2：As far as possible to use mobile power supply, if you use power adapter, try to use 5V / 2A, brand power adapter. 3：If the receiver is lost or damaged, it can apply to the manufacturer for purchase. 4: shared writing board software, you can apply to the manufacturer for free. 5：Email:[email protected] Any 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. 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. 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.

Page 1 of 6 Report No.: LGT23E073 Appendix - External Photographs of EUT Constructional Details Model: 055SFA Photo 1 Photo 2 Page 2 of 6 Report No.: LGT23E073 Photo 3 Photo 4 Page 3 of 6 Report No.: LGT23E073 Photo 5 Photo 6 Page 4 of 6 Report No.: LGT23E073 Photo 7 Photo 8 Page 5 of 6 Report No.: LGT23E073 Photo 9 Photo 10 Page 6 of 6 Report No.: LGT23E073 Photo 11 Photo 12

Page 1 of 5 Report No.: LGT23E073 Appendix - Internal Photographs of EUT Constructional Details Model: 055SFA Photo 1 Photo 2 Page 2 of 5 Report No.: LGT23E073 Photo 3 Photo 4 Page 3 of 5 Report No.: LGT23E073 Photo 5 Photo 6 Page 4 of 5 Report No.: LGT23E073 Photo 7 Photo 8 Page 5 of 5 Report No.: LGT23E073 Photo 9

RF Exposure Report FCC ID: 2BBKP-055SFA RF Exposure Measurement The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The gain of the antennas used in the product is extracted from the Antenna data sheets provided and also the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. Although the Friis Transmission formula is far field assumption, the calculated result of that is an over-prediction for near field power density. It is taken as worst case to specify the safety range. RF Exposure Limit According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of the human exposure to radio-frequency (RF) radiation as specified in 1.1307 (b) Limits for Maximum Permissible Exposure (MPE) F= Frequency in MHz Friss Formula Friss Transmission Formula: Pd = (Pout * G) / (4*pi*r²) Where Pd = power density in mW/cm² Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = Distance between observation point and the center of radiator in cm If we know the maximum gain of the antenna and the total output power to the antenna, through calculation, we will know MPE value at distance 20cm. EUT Operation condition EUT was enabled to transmit and receive at lowest, middle and highest channels. Classification The antenna of this product, under normal use condition, is at least 20cm away from the body of the user. Warning statement to the user for keeping at least 20cm or more separation distance from the antenna should be included in the User manual. So, this device is classified as Mobile device. Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm²) Limits for Occupational / controlled Exposures 300 - 1500 -- -- F/300 1500 – 100000 -- -- 5.0 Limits for General population / Uncontrolled Exposure 300 - 1500 -- -- F/1500 1500 – 100000 -- -- 1.0 BLE Mode BLE Detector PEAK Ant Gain(dBi) 2 BLE1M 1±1dBm ANT Gain (G) Antenna A gain: 2 dBi (gain of antenna in linear scale=1.585) BLE1M1.58521.58490.000501 Power Density (mW/cm²) Limit (mW/cm²) ANT Gain(gain of antenna in linear scale) Protocol Output Power to Antenna (dBm) Output Power to Antenna (mW) Maximum Power Density (S) is0.00050 (mW/ cm2) does not exceed Limit of Power Density (S) 1 (mW/ cm2).

承认书项目表 内容 页数页码 NO. （Number（Page （ Contents ） ofPage ） Code ） 1 承认书封面（ SpecCover ） 11 2 承认书项目表（ SpecItem ） 12 3 工程成品图（ Drawing ） 13 4 电性测试报告（ TestReports ） 14 5 S 参数测试（ SParameter ） 15 6 增益测试（ GainTest ） 16 7 8 9 10--- 11--- 12--- 东莞市脉讯电子有限公司Tel:0769-33691210Fax:0769-82381572 DESCRIPTIONSIGNDATEAPPROVER D C B PC+ABS Part Number Description 本体 AN2809 1 No. Finished 黑色 Material 2 铜 SMA 公头 SMA0806 镀金 1 1 Q ty 东莞市脉讯电子有限公司 YD 2022-04-13 SCALE: 1/1 UNITS: mm REVISION: A APPROVED BY Tolerance TITLE:2.4gAntenna PART NO.: MX2400-2809-SGG DWG NAME:MX2400-2809-SGG.DWG CHECKED BY DESIDNED BY ±3°X° X.X ±0.20 X.XX ±0.10 leon 2022-04-13 jeff 2022-04-13 电性测试报告 TestReports 2 dBi <= 2.0 Sample Photo A. Electrical Characteristics Frequency 2400 ~ 2500 MHz S.W.R. Antenna Gain Polarization Linear Impedance 50 Ohm B. Material & Mechanical Characteristics Material of Radiator Cu Material of Plastic Body: PC+ABS Connector Type SMA Male Reverse Connector Pull Test >= 2 Kg C. Environmental Operation Temperature - 40 °C ~ + 65 °C Storage Temperature - 40 °C ~ + 80 °C 东莞市脉讯电子有限公司Tel:0769-33691210Fax:0769-82381572 S 参数测试 SParameterTest AgilentE5071C 东莞市脉讯电子有限公司Tel:0769-33691210Fax:0769-82381572 增益测试 GainTest Antenna Radiation Pattern VS Gain 东莞市脉讯电子有限公司Tel:0769-33691210Fax:0769-82381572

Page 1 of 1 Report No.: LGT23E073 Appendix - Test Setup photos Radiated Spurious Emission Test Setup Photo - Below 1GHz Radiated Spurious Emission Test Setup Photo - Above 1GHz

The test report is effective only with both signature and specialized stamp. This report shall not be reproduced except in full without the written approval of the Laboratory. The results in this report only apply to the tested sample. Shenzhen LGT Test Service Co., Ltd. Tel: 0755-89668180 E-mail:[email protected] Web: www.lgt-cert.com Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China RF TEST REPORT Product Name: shared writing board Model Name: 055SFA, 021SFA,015SFA,065SFA FCC ID: 2BBKP-055SFA Issued For : SuZhou Yunzhiweihao Electronic Technology Co., Ltd. 1-1808 ShuangYin xingzuo business Square Changqiao Street Wuzhong Suzhou, China. Issued By : Shenzhen LGT Test Service Co., Ltd. Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Report Number: LGT23E073RF01 Sample Received Date: Jun. 02, 2023 Date of Test: Jun. 02, 2023 ~ Jun. 19, 2023 Date of Issue: Jun. 19, 2023 Report No.: LGT23E073RF01 Page 2 of 47 TEST REPORT CERTIFICATION Applicant: SuZhou Yunzhiweihao Electronic Technology Co., Ltd. Address: 1-1808 ShuangYin xingzuo business Square Changqiao Street Wuzhong Suzhou, China. Manufacturer: Suzhou Kexin Electronic Technology Co. LTD. Address: Huangqiao Village, Huangqiao Town, Xiangcheng District, Suzhou City, China. Product Name: shared writing board Trademark: N/A Model Name: 055SFA, 021SFA,015SFA,065SFA Sample Status: Normal APPLICABLE STANDARDS STANDARD TEST RESULTS FCC Part 15.247, Subpart C ANSI C63.10-2013 PASS Prepared by: Approved by: Zane Shan Vita Li Engineer Technical Director Report No.: LGT23E073RF01 Page 3 of 47 Table of Contents Page 1. SUMMARY OF TEST RESULTS 6 1.1 TEST FACTORY 7 1.2 MEASUREMENT UNCERTAINTY 7 2. GENERAL INFORMATION 8 2.1 GENERAL DESCRIPTION OF THE EUT 8 2.2 DESCRIPTION OF THE TEST MODES 10 2.3 TEST SOFTWARE AND POWER LEVEL 10 2.4 DESCRIPTION OF NECESSARY ACCESSORIES AND SUPPORT UNITS 11 2.5 EQUIPMENTS LIST 12 3. EMC EMISSION TEST 13 3.1 CONDUCTED EMISSION MEASUREMENT 13 3.2 TEST PROCEDURE 14 3.3 TEST SETUP 14 3.4 EUT OPERATING CONDITIONS 14 3.5 TEST RESULTS 14 4. RADIATED EMISSION MEASUREMENT 15 4.2 TEST PROCEDURE 17 4.3 TEST SETUP 18 4.4 EUT OPERATING CONDITIONS 18 4.5 FIELD STRENGTH CALCULATION 19 4.7 TEST RESULTS (BAND EDGE REQUIREMENTS) 25 5. CONDUCTED SPURIOUS & BAND EDGE EMISSION 27 5.1 LIMIT 27 5.2 TEST PROCEDURE 27 5.3 TEST SETUP 27 5.4 EUT OPERATION CONDITIONS 27 5.5 TEST RESULTS 27 6. POWER SPECTRAL DENSITY TEST 28 6.1 LIMIT 28 6.2 TEST PROCEDURE 28 6.3 TEST SETUP 28 6.4 EUT OPERATION CONDITIONS 28 6.5 TEST RESULTS 28 Report No.: LGT23E073RF01 Page 4 of 47 Table of Contents Page 7. BANDWIDTH TEST 29 7.1 LIMIT 29 7.2 TEST PROCEDURE 29 7.3 TEST SETUP 29 7.4 EUT OPERATION CONDITIONS 29 7.5 TEST RESULTS 29 8. PEAK OUTPUT POWER TEST 30 8.1 LIMIT 30 8.2 TEST PROCEDURE 30 8.3 TEST SETUP 30 8.4 EUT OPERATION CONDITIONS 30 8.5 TEST RESULTS 30 9. ANTENNA REQUIREMENT 31 9.1 STANDARD REQUIREMENT 31 9.2 EUT ANTENNA 31 APPENDIX I:TEST RESULTS 32 DUTY CYCLE 32 MAXIMUM PEAK CONDUCTED OUTPUT POWER 34 -6DB BANDWIDTH 35 OCCUPIED CHANNEL BANDWIDTH 37 MAXIMUM POWER SPECTRAL DENSITY LEVEL 39 BAND EDGE 41 CONDUCTED RF SPURIOUS EMISSION 44 APPENDIX II: TEST PHOTO 47 Report No.: LGT23E073RF01 Page 5 of 47 Revision History Rev. Issue Date Contents 00 Jun. 19, 2023 Initial Issue Report No.: LGT23E073RF01 Page 6 of 47 1. SUMMARY OF TEST RESULTS Test procedures according to the technical standards: KDB 558074 D01 15.247 Meas Guidance v05r02. FCC Part 15.247, Subpart C Standard Section Test Item Judgment Remark 15.207 Conducted Emission N/A -- 15.247 (a)(2) 6dB Bandwidth PASS -- 15.247 (b)(3) Output Power PASS -- 15.209 Radiated Spurious Emission PASS -- 15.247 (d) Conducted Spurious & Band Edge Emission PASS -- 15.247 (e) Power Spectral Density PASS -- 15.205 Restricted Band Edge Emission PASS -- Part 15.247(d)/ Part 15.209(a) Band Edge Emission PASS -- 15.203 Antenna Requirement PASS -- NOTE: (1) ‘N/A’ denotes test is not applicable in this Test Report. (2) All tests are according to ANSI C63.10-2013. Report No.: LGT23E073RF01 Page 7 of 47 1.1 TEST FACTORY Company Name: Shenzhen LGT Test Service Co., Ltd. Address: Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Accreditation Certificate A2LA Certificate No.: 6727.01 FCC Registration No.: 746540 CAB ID: CN0136 1.2 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence of approximately 95 %. No. Item Uncertainty 1 RF output power, conducted ±0.68dB 2 Unwanted Emissions, conducted ±2.988dB 3 All emissions, radiated 9K-30MHz ±2.84dB 4 All emissions, radiated 30M-1GHz ±4.39dB 5 All emissions, radiated 1G-6GHz ±5.10dB 6 All emissions, radiated>6G ±5.48dB 7 Conducted Emission (9KHz-150KHz) ±2.79dB 8 Conducted Emission (150KHz-30MHz) ±2.80dB Note: The measurement uncertainty is not included in the test result. Report No.: LGT23E073RF01 Page 8 of 47 2. GENERAL INFORMATION 2.1 GENERAL DESCRIPTION OF THE EUT Product Name: shared writing board Trademark: N/A Model Name: 055SFA Series Model: 021SFA,015SFA,065SFA Model Difference: The difference only in the appearance size. Product Description: The EUT is a shared writing board Operation Frequency: 2402~2480 MHz Modulation Type: GFSK Radio Technology: BLE Bluetooth Configuration: BLE (1M PHY) Number Of Channel: 40 Antenna Designation: Please refer to the Note 3. Antenna Gain (dBi) 2 Channel List: Please refer to the Note 2. Rating: DC 5V Hardware Version: N/A Software Version: N/A Connecting I/O Port(s): Please refer to the Note 1. Note: 1. For a more detailed features description, please refer to the manufacturer’s specificat…

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