2A2I7-DW156R7Laptop computer

Shenzhen Shuangshengda Technology Co., Ltd 2021.06.21 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Laptop computer Trademark: N/A MODEL : DW-156R7, DW-156R5, DW-156M-3, DW-156M, DW-156U, DW- 156M-4 DW-156M-5, DW-156U-MX, DW-156G-A, DW-156G-7 DW-156NP, DW- 156J FCC ID : 2A2I7-DW156R7 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 - software security requirement 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 : Xiang Ren Bo / Manager Contact information / address: 209 Room, Building A, HuangJinShan111 street, Bantian Town, Longgang District, Shenzhen, China

Shenzhen Shuangshengda Technology Co., Ltd Model Difference 2021-06-21 EUT NAME: Laptop computer FCC ID: 2A2I7-DW156R7 MODEL : DW-156R7, DW-156R5, DW-156M-3, DW-156M, DW-156U, DW-156M-4 DW-156M-5, DW-156U-MX, DW-156G-A, DW-156G-7 DW-156NP, DW-156J All the model are the same circuit and RF module, only for model name and color. Regards Sincerely Client’s signature: Client’s name / title : Xiang Ren Bo / Manager Contact information / address: 209 Room, Building A, HuangJinShan111 street, Bantian Town, Longgang District, Shenzhen, China

ExternalPhotos

Size:40*20mm Laptop computer FCC ID: 2A2I7-DW156R7 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. Label location

InternalPhotos WIFI Antenna WIFI+BT Antenna

Shenzhen BCTC Testing Co., Ltd. FCC ID: 2A2I7-DW156R7 Portable device According to §15.247(e)(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. BT: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 -0.422 0.91 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 -0.896 0.81 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -1.235 0.75 -1±1 0.00 1.00 <5 0.31496 3.00 YES 2.402 -0.379 0.92 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 -0.873 0.82 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -1.198 0.76 -1±1 0.00 1.00 <5 0.31496 3.00 YES 2.402 0.026 1.01 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 -0.358 0.92 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -0.685 0.85 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK Pi/4 DQPSK 8DPSK 2.4G WIFI: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.4127.4715.598±19.007.94<52.467283.00YES 2.4377.1595.208±19.007.94<52.480033.00YES 2.4627.3065.388±19.007.94<52.492723.00YES 2.4125.7263.746±17.005.01<51.556753.00YES 2.4375.4793.536±17.005.01<51.564803.00YES 2.4625.6733.696±17.005.01<51.572803.00YES 2.4126.4654.437±18.006.31<51.959833.00YES 2.4376.3644.337±18.006.31<51.969963.00YES 2.4626.384.357±18.006.31<51.980043.00YES 2.4226.4384.407±18.006.31<51.963893.00YES 2.4376.3464.317±18.006.31<51.969963.00YES 2.4526.3364.307±18.006.31<51.976013.00YES 802.11b (The worst mode) 802.11g (The worst mode) 802.11n2 0 (MIMO) 802.11n4 0 (MIMO) Shenzhen BCTC Testing Co., Ltd. 5.8G WIFI: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 5.745 5.821 3.82 6±1 7.00 5.01 <5 2.40256 3.00 YES 5.785 5.147 3.27 6±1 7.00 5.01 <5 2.41091 3.00 YES 5.825 5.261 3.36 6±1 7.00 5.01 <5 2.41923 3.00 YES 5.745 5.901 3.89 6±1 7.00 5.01 <5 2.40256 3.00 YES 5.785 5.725 3.74 6±1 7.00 5.01 <5 2.41091 3.00 YES 5.825 5.819 3.82 6±1 7.00 5.01 <5 2.41923 3.00 YES 5.755 5.919 3.91 6±1 7.00 5.01 <5 2.40465 3.00 YES 5.795 5.227 3.33 6±1 7.00 5.01 <5 2.41300 3.00 YES 5.745 5.816 3.82 6±1 7.00 5.01 <5 2.40256 3.00 YES 5.785 5.532 3.57 6±1 7.00 5.01 <5 2.41091 3.00 YES 5.825 5.802 3.80 6±1 7.00 5.01 <5 2.41923 3.00 YES 5.755 5.333 3.41 6±1 7.00 5.01 <5 2.40465 3.00 YES 5.795 5.050 3.20 6±1 7.00 5.01 <5 2.41300 3.00 YES 802.11ac80 (MIMO) 5.775 5.375 3.45 6±1 7.00 5.01 <5 2.40883 3.00 YES 802.11a (The worst mode) 802.11n20 (MIMO) 802.11n40 (MIMO) 802.11ac20 (MIMO) 802.11ac40 (MIMO) Conclusion: For the max result : 2.49272W/Kg ≤ FCC Limit 3.0 for 1g SAR. The Product unsupported at the same time to Transmitting.

No.：BCTC/RF-EMC-007 Page: 1 of 69 Edition：A.3 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2105542909-3E Applicant: Shenzhen Shuangshengda Technology Co., Ltd Product Name: Laptop computer Model/Type reference: DW-156R7 Tested Date: 2021-06-01 to 2021-06-17 Issued Date: 2021-07-16 Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 2 of 69 Edition：A.3 FCC ID : 2A2I7-DW156R7 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: Laptop computer Trademark: N/A Model/Type reference: DW-156R7 DW-156R5, DW-156M-3, DW-156M, DW-156U, DW-156M-4 DW-156M-5, DW-156U-MX, DW-156G-A, DW-156G-7 DW-156NP, DW-156J Prepared For: Shenzhen Shuangshengda Technology Co., Ltd Address: 209 Room, Building A, HuangJinShan111 street, Bantian Town, Longgang District, Shenzhen, China Manufacturer: Shenzhen Shuangshengda Technology Co., Ltd Address: 209 Room, Building A, HuangJinShan111 street, Bantian Town, 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, Tangwei, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2021-05-18 Sample tested Date: 2021-06-01 to 2021-06-17 Issue Date: 2021-07-16 Report No.: BCTC2105542909-3E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Lei Chen/Project Handler Zero Zhou/Reviewer Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 3 of 69 Edition：A.3 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 ............................................... 14 6.5 Test Result ........................................................... 15 7. RADIATED EMISSIONS .............................................. 17 7.1 Block Diagram Of Test Setup ............................................ 17 7.2 Limit ................................................................. 18 7.3 Test procedure ........................................................ 19 7.4 EUT operating Conditions ............................................... 20 7.5 Test Result ........................................................... 21 8. RADIATED BAND EMISSION MEASUREMENT AND RESTRICTED BANDS OF OPERATION .............................................................. 25 8.1 Block Diagram Of Test Setup ............................................ 25 8.2 Limit ................................................................. 25 8.3 Test procedure ........................................................ 26 8.4 EUT operating Conditions ............................................... 26 8.5 Test Result ........................................................... 27 9. CONDUCTED EMISSION ............................................. 28 9.1 Block Diagram Of Test Setup ............................................ 28 9.2 Limit ................................................................. 28 9.3 Test procedure ........................................................ 28 9.4 Test Result ........................................................... 29 10. 20 DB BANDWIDTH .................................................. 38 10.1 Block Diagram Of Test Setup .......................................... 38 Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 4 of 69 Edition：A.3 10.2 Limit ................................................................ 38 10.3 Test procedure ....................................................... 38 10.4 Test Result .......................................................... 39 11. MAXIMUM PEAK OUTPUT POWER .................................... 44 11.1 Block Diagram Of Test Setup .......................................... 44 11.2 Limit ................................................................ 44 11.3 Test procedure ....................................................... 44 11.4 Test Result .......................................................... 45 12. HOPPING CHANNEL SEPARATION ................................... 50 12.1 Block Diagram Of Test Setup .......................................... 50 12.2 Limit ................................................................ 50 12.3 Test procedure ....................................................... 50 12.4 Test Result .......................................................... 51 13. NUMBER OF HOPPING FREQUENCY .....…

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Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 42 of 69 Edition：A.3 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 43 of 69 Edition：A.3 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 44 of 69 Edition：A.3 11. MAXIMUM PEAK OUTPUT POWER 11.1 Block Diagram Of Test Setup 11.2 Limit FCC Part15 (15.247) , Subpart C Section Test Item Limit Frequency Range (MHz) Result 15.247(b)(1) Peak Output Power 0.125 watt or 21dBm 2400-2483.5 PASS 11.3 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 = 3MHz. VBW = 3MHz. Sweep = auto; Detector Function = Peak. 3. Keep the EUT in transmitting at lowest, medium and highest channel individually. Record the max value. Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 45 of 69 Edition：A.3 11.4 Test Result Temperature： 26°C Relative Humidity： 54% Test Voltage ： AC 120V/60Hz Remark: N/A Modulation Test Channel Output Power (dBm) Limit (dBm) GFSK Low -0.422 21 GFSK Middle -0.896 21 GFSK High -1.235 21 Pi/4 DQPSK Low -0.379 21 Pi/4 DQPSK Middle -0.873 21 Pi/4 DQPSK High -1.198 21 8DPSK Low 0.026 21 8DPSK Middle -0.358 21 8DPSK High -0.685 21 Test plots GFSK Low Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 46 of 69 Edition：A.3 GFSK Middle Channel GFSK High Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 47 of 69 Edition：A.3 Pi/4 DQPSK Low Channel Pi/4 DQPSK Middle Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 48 of 69 Edition：A.3 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 49 of 69 Edition：A.3 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 50 of 69 Edition：A.3 12. HOPPING CHANNEL SEPARATION 12.1 Block Diagram Of Test Setup 12.2 Limit Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hopping channel, whichever is greater. Alternatively, frequency hopping systems operating in the 2400-2483.5 MHz band may have hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the hopping channel, whichever is greater, provided the systems operate with an output power no greater than 0.125W. 12.3 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 = 30kHz. VBW = 100kHz , Span = 2.0MHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. The limit is specified in one of the subparagraphs of this Section Submit this plot. Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 51 of 69 Edition：A.3 12.4 Test Result Modulation Test Channel Separation (MHz) Limit(MHz) Result GFSK Low 1.000 0.621 PASS GFSK Middle 1.000 0.619 PASS GFSK High 0.998 0.620 PASS Pi/4 DQPSK Low 1.004 0.812 PASS Pi/4 DQPSK Middle 1.002 0.813 PASS Pi/4 DQPSK High 1.000 0.811 PASS 8DPSK Low 1.000 0.803 PASS 8DPSK Middle 1.008 0.803 PASS 8DPSK High 1.006 0.802 PASS Test plots GFSK Low Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 52 of 69 Edition：A.3 GFSK Middle Channel GFSK High Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 53 of 69 Edition：A.3 Pi/4 DQPSK Low Channel Pi/4 DQPSK Middle Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 54 of 69 Edition：A.3 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 55 of 69 Edition：A.3 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 56 of 69 Edition：A.3 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; Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 57 of 69 Edition：A.3 13.4 Test Result Test Plots: 79 Channels in total GFSK Pi/4 DQPSK Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 58 of 69 Edition：A.3 8DPSK Report No.: BCTC2105542909-3E No.：BCTC/RF-EMC-007 Page: 59 of 69 Edition：A.3 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 o…

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Report No.: BCTC2105542909-1E No.：BCTC/RF-EMC-005 Page: 65 of 67 Edition：A.3 16. EUT TEST SETUP PHOTOGRAPHS Conducted Emission Report No.: BCTC2105542909-1E No.：BCTC/RF-EMC-005 Page: 66 of 67 Edition：A.3 Radiated Measurement Photos Report No.: BCTC2105542909-2E No.：BCTC/RF-EMC-005 Page: 80 of 81 Edition：A.3 Radiated Measurement Photos