2ASLT-DBK01TWS Bluetooth headset

FCC Caution： 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. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 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. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

SHENZHEN XIWXI TECHNOLOGY CO., LTD 2021.04.27 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: TWS Bluetooth headset Trademark: N/A MODEL : DBK01 FCC ID: 2ASLT-DBK01 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 : LI HAIBO /Manager Contact information / address: No. 47, the 3rd Shabo Road, Shajing Town, Bao'an District, Shenzhen, China

SHENZHEN XIWXI TECHNOLOGY CO., LTD 2021.04.27 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 : LI HAIBO/Manager Contact information / address: No. 47, the 3rd Shabo Road, Shajing Town, Bao'an District, Shenzhen, China

External Photos

Label & label location 10mm*5mm FCC ID: 2ASLT-DBK01 Label location Label location

Internal Photos Antenna Antenna

RF EXPOSURE EVALUATION METHOD FCC ID: 2ASLT-DBK01 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-EDR max possible output power (PK,conducted)：-1±1dbm -3.01dBi logarithmic terms convert to numeric result is nearly 0.500 0dBm=1.00mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=1.00/5*√2.402=0.31≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. Modulation Frequency (MHz) Output Power (dBm) Max Antenna Gain (dBi) GFSK 2402 -3.969 -3.01 GFSK 2441 -3.099 -3.01 GFSK 2480 -2.067 -3.01 Pi/4 DQPSK 2402 -3.057 -3.01 Pi/4 DQPSK 2441 -2.201 -3.01 Pi/4 DQPSK 2480 -1.174 -3.01 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=1.00/5*√2.441=0.31≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=1.00/5*√2.48=0.31≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. Conclusion: No SAR is required.

No.：BCTC/RF-EMC-005 Page 1 of 60 Edition：A.3 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2103856883E Applicant: SHENZHEN XIWXI TECHNOLOGY CO., LTD Product Name: TWS Bluetooth headset Model/Type Ref.: DBK01 Tested Date: 2021-03-31 to 2021-04-13 Issued Date: 2021-04-13 Report No.: BCTC2103856883E No.：BCTC/RF-EMC-005 Page 2 of 60 Edition：A.3 FCC ID: 2ASLT-DBK01 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: TWS Bluetooth headset Trademark: N/A Model/Type Ref.: DBK01 Prepared For: SHENZHEN XIWXI TECHNOLOGY CO., LTD Address: No. 47, the 3rd Shabo Road, Shajing Town, Bao'an District, Shenzhen, China Manufacturer: SHENZHEN XIWXI TECHNOLOGY CO., LTD Address: No. 47, the 3rd Shabo Road, Shajing Town, Bao'an 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: 2021-03-31 Sample tested Date: 2021-03-31 to 2021-04-13 Issue Date: 2021-04-13 Report No.: BCTC2103856883E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Willem Wang/Project Handler Zero Zhou/Reviewer Report No.: BCTC2103856883E No.：BCTC/RF-EMC-005 Page 3 of 60 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 ............................................... 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 ........................................................... 20 8. RADIATED BAND EMISSION MEASUREMENT AND RESTRICTED BANDS OF OPERATION ................................................... 24 8.1 Block Diagram Of Test Setup ............................................ 24 8.2 Limit ................................................................. 24 8.3 Test procedure ........................................................ 25 8.4 EUT operating Conditions ............................................... 25 8.5 Test Result ........................................................... 26 9. CONDUCTED EMISSION .............................................. 27 9.1 Block Diagram Of Test Setup ............................................ 27 9.2 Limit ................................................................. 27 9.3 Test procedure ........................................................ 27 9.4 Test Result ........................................................... 28 10. 20 DB BANDWIDTH .................................................. 34 10.1 Block Diagram Of Test Setup .......................................... 34 Report No.: BCTC2103856883E No.：BCTC/RF-EMC-005 Page 4 of 60 Edition：A.3 10.2 Limit ................................................................ 34 10.3 Test procedure ....................................................... 34 10.4 Test Result .......................................................... 35 11. MAXIMUM PEAK OUTPUT POWER .................................... 39 11.1 Block Diagram Of Test Setup .......................................... 39 11.2 Limit ................................................................ 39 11.3 Test procedure ....................................................... 39 11.4 Test Result .......................................................... 40 12. HOPPING CHANNEL SEPARATION .................................... 44 12.1 Block Diagram Of Test Setup .......................................... 44 12.2 Limit ................................................................ 44 12.3 Test procedure ....................................................... 44 12.4 Test Result .......................................................... 45 13. NUMBER OF HOPPING FREQUENCY .................................. 49 13.1 Block Diagram Of Test Setup .......................................... 49 13.2 Limit ................................................................ 49 13.3 …

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Report No.: BCTC2103856883E No.：BCTC/RF-EMC-005 Page 58 of 60 Edition：A.3 17. EUT TEST SETUP PHOTOGRAPHS Conducted emissions Radiated Measurement Photos Report No.: BCTC2103856883E No.：BCTC/RF-EMC-005 Page 59 of 60 Edition：A.3