2ADBHLB-0303DWireless Keyboard

16 16 “connect” 8 Brightness - Brightness + 8

Rev 11/20/07 (ShenZhen DeFengYuan Technology Co.,Ltd) Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2ADBHLB-0303D Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block Diagram, Schematics, Operational Description Block Diagram Schematics Operational Description 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. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, (Ma Yixun)

(ShenZhen DeFengYuan Technology Co.,Ltd) Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Date: 2022.11.9 SUBJECT: FCC Application for FCC ID: 2ADBHLB-0303D To Whom It May Concern: We, the undersigned, hereby authorize Alan Mei at Shenzhen BCTC Testing Co., Ltd. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Alan Mei of Shenzhen BCTC Testing Co., Ltd. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, (Ma Yixun)

ShenZhen DeFengYuan Technology Co.,Ltd Model Difference Product description: Wireless Keyboard Model name: LB-0303D CK-2072D, J-3125/6D, J-3128D, T-5508D, T-5507D, X7, X6, KB505, KC002, B101, B102, PJ-5022, T5506D, T5509D, T5206D, T5207D, T5208D, U7, U8 Trade Name: N/A FCC ID: 2ADBHLB-0303D All the model are the same circuit and RF module, except model names. Regards Sincerely Client’s signature: Client’s name / title : Ma Yixun /Manager Contact information / address: Room 309, 3F,Building 1, Liuwei Business Center, No. 5, Longjing Village Yangmei Community, Bantian Street, Longgang District, Shenzhen, China

External Photos

Label & label location Wireless Keyboard FCC ID: 2ADBHLB-0303D

Internal Photos Antenna

RF EXPOSURE EVALUATION METHOD FCC ID: 2ADBHLB-0303D 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. BLE Condition Mode Frequency (MHz) Conducted Power (dBm) Limit (dBm) Verdict NVNT BLE 1M 2402 2.78 21 Pass NVNT BLE 1M 2440 2.75 21 Pass NVNT BLE 1M 2480 3.19 21 Pass max possible output power (PK,conducted)：4±1dBm 2.34dBi logarithmic terms convert to numeric result is nearly 1.714 5dBm=3.16mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 3.16/5*√2.402=0.98≤3.0 2440MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 3.16/5*√2.440=0.99≤3.0 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 3.16/5*√2.48=1.00≤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.

Antenna Specification Specifications Summary ITEM SPEC. Model Name IBM 2.4 GHz Center Frequency 2402 MHz 2441 MHz 2480 MHz 2.34 dBi 2.07 dBi 1.45 dBi MAX. GAIN 2.34 dBi Polarization Horizontal Azimuth Beam Pattern Omni-directional Impedance 50 Ω Antenna Length 3.1 cm Antenna Photo & Length ( mm ) Test Address 16 Tzu Chiang Road, Hsinchu Industrial District Hsinchu Hsien 303 , Taiwan Test Date 2019-10-13 Test Instrument vector network analyzer - R&S ZVB20 1. Main antenna : 2402 MHz 1.1 Horizontal Frequency(MHZ): 2402 Antenna Polarity: Horizontal Maximum Value(dBi): 2. 34 Average Gain(dBi) : -2.48 Minimum Gain(dBi): -55.18 1.2 Vertical Frequency(MHZ): 2402 Antenna Polarity: Vertical Maximum Value(dBi): -4.51 Average Gain(dBi) : -8.98 Minimum Gain(dBi): -62.3 2. Main antenna : 2441 MHz 2.1 Horizontal Frequency(MHZ): 2441 Antenna Polarity: Horizontal Maximum Value(dBi): 2.07 Average Gain(dBi) : -2.54 Minimum Gain(dBi): -66.98 2.2 Vertical Frequency(MHZ): 2441 Antenna Polarity: Vertical Maximum Value(dBi): -4.29 Average Gain(dBi) : -8.81 Minimum Gain(dBi): -51.4 2. Main antenna : 2480 MHz 2.1 Horizontal Frequency(MHZ): 2480 Antenna Polarity: Horizontal Maximum Value(dBi): 1.45 Average Gain(dBi) : -3.34 Minimum Gain(dBi): -53.4 2.2 Vertical Frequency(MHZ): 2480 Antenna Polarity: Vertical Maximum Value(dBi): -4.95 Average Gain(dBi) : -9.06 Minimum Gain(dBi): -60.00

No.：BCTC/RF-EMC-005 Page: 1 of 43 Edition：A.5 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2212371291E Applicant: ShenZhen DeFengYuan Technology Co.,Ltd Product Name: Wireless Keyboard Model/Type Ref.: LB-0303D Tested Date: 2022-11-01 to 2022-11-07 Issued Date: 2022-12-02 Report No.: BCTC2212371291E No.：BCTC/RF-EMC-005 Page: 2 of 43 Edition：A.5 FCC ID:2ADBHLB-0303D 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: Wireless Keyboard Trademark: N/A Model/Type Ref.: LB-0303D CK-2072D, J-3125/6D, J-3128D, T-5508D, T-5507D, X7, X6, KB505, KC002, B101, B102, PJ-5022, T5506D, T5509D, T5206D, T5207D, T5208D, U7, U8 Prepared For: ShenZhen DeFengYuan Technology Co.,Ltd Address: Room 309, 3F,Building 1, Liuwei Business Center, No. 5, Longjing Village Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Manufacturer: ShenZhen DeFengYuan Technology Co.,Ltd Address: Room 309, 3F,Building 1, Liuwei Business Center, No. 5, Longjing Village Yangmei Community, Bantian Street, Longgang District, Shenzhen, China 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: 2022-11-01 Sample tested Date: 2022-11-01 to 2022-11-07 Issue Date: 2022-12-02 Report No.: BCTC2212371291E Test Standards: FCC Part15.247 ANSI C63.10-2013 Test Results: PASS Remark: This is Bluetooth BLE radio test report. Tested by: Approved by: Kelsey Tan/ Project Handler Zero Zhou/Reviewer Report No.: BCTC2212371291E No.：BCTC/RF-EMC-005 Page: 3 of 43 Edition：A.5 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 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ............................................................................................................. 9 4.6 Table Of Parameters Of Text Software Setting ..................................................... 9 5. Test Facility And Test Instrument Used ............................................................... 10 5.1 Test Facility ......................................................................................................... 10 5.2 Test Instrument Used .......................................................................................... 10 6. Conducted Emissions .......................................................................................... 12 6.1 Block Diagram Of Test Setup .............................................................................. 12 6.2 Limit .................................................................................................................... 12 6.3 Test Procedure ................................................................................................... 12 6.4 EUT Operating Conditions .................................................................................. 12 6.5 Test Result .......................................................................................................... 13 7. Radiated Emissions ............................................................................................. 15 7.1 Block Diagram Of Test Setup .............................................................................. 15 7.2 Limit .................................................................................................................... 16 7.3 Test Procedure ................................................................................................... 17 7.4 EUT Operating Conditions .................................................................................. 18 7.5 Test Result .......................................................................................................... 18 8. Radiated Band Emission Measurement And Restricted Bands Of Operation ..... 22 8.1 Block Diagram Of Test Setup .............................................................................. 22 8.2 Limit .................................................................................................................... 22 8.3 Test Procedure ................................................................................................... 23 8.4 EUT operating Conditions ................................................................................... 23 8.5 Test Result .......................................................................................................... 24 9. Power Spectral Density Test ............................................................................... 25 9.1 Block Diagram Of Test Setup .............................................................................. 25 9.2 Limit .................................................................................................................... 25 9.3 Test Procedure .....................................................................................…

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Report No.: BCTC2211893451E No.：BCTC/RF-EMC-005 Page: 41 of 43 Edition：A.5 15. EUT Test Setup Photographs Conducted Measurement Photo Radiated Measurement Photos Report No.: BCTC2211893451E No.：BCTC/RF-EMC-005 Page: 42 of 43 Edition：A.5