2AFSG-T719DTWS Bluetooth Headset Cloud Nest

(Dongguan Jin wen hua digital technology Co., LTD.) (September 15, 2023) 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: 2AFSG-T719D) [Dongguan Jin wen hua digital 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) Luo Peng (Dongguan Jin wen hua digital technology Co., LTD.) (September 15, 2023) 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: 2AFSG-T719D) [Dongguan Jin wen hua digital 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) Luo Peng

Dongguan Jin wen hua digital technology Co., LTD. (September 15, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (TWS Bluetooth Headset Cloud Nest / T719D / FCC ID: 2AFSG-T719D) 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 Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Signature: Name: Luo Peng Title: Manager

Dongguan Jin wen hua digital technology Co., LTD. (September 15, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology 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, Signature: Name: Luo Peng Title: Manager

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FCC ID LABEL: Label Location: FCC ID: 2AFSG-T719D Model No.: T719D

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Shenzhen CTB Testing Co., Ltd. FCC ID: 2AFSG-T719D 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. EDR: 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 -0.669 0.86 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 -0.823 0.83 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -0.279 0.94 0±1 1.00 1.26 <5 0.39651 3.00 YES 2.402 0.163 1.04 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 0.015 1.00 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 0.542 1.13 0±1 1.00 1.26 <5 0.39651 3.00 YES 2.402 0.484 1.12 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 0.357 1.09 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 1.001 1.26 1±1 2.00 1.58 <5 0.49918 3.00 YES GFSK π /4DQPSK 8DQPSK Conclusion: For the max result : 0.49918≤ FCC Limit 3.0 for 1g SAR.

TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. 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 CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: TWS Bluetooth Headset Cloud Nest FCC ID: 2AFSG-T719D Trademark: N/A Model Number: T719D Prepared For: Dongguan Jin wen hua digital technology Co., LTD. Address: NO.1 Hua Da Road, Long Bei Ling Village, Tangxia Town, Dongguan City, Guangdong, China Manufacturer: Dongguan Jin wen hua digital technology Co., LTD. Address: NO.1 Hua Da Road, Long Bei Ling Village, Tangxia Town, Dongguan City, Guangdong, China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Jul. 26, 2023 Sample tested Date: Jul. 26, 2023 to Aug. 03, 2023 Issue Date: Aug. 03, 2023 Report No.: CTB230803034RFX Test Standards FCC Part15.247 ANSI C63.10:2013 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.:CTB230803034RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 58 TABLE OF CONTENT Test Report Declaration Page 1. VERSION .......................................................................... 4 2. TEST SUMMARY ................................................................... 5 3. MEASUREMENT UNCERTAINTY ..................................................... 6 4. PRODUCT INFORMATION AND TEST SETUP .......................................... 7 4.1 Product Information .................................................................... 7 4.2 Test Setup Configuration ............................................................... 7 4.3 Support Equipment .................................................................... 7 4.4 Channel List .......................................................................... 8 4.5 Test Mode ............................................................................ 8 4.6 Test Environment ...................................................................... 8 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................... 9 5.1 Test Facility ........................................................................... 9 5.2 Test Instrument Used .................................................................. 9 6. AC POWER LINE CONDUCTED EMISSION ............................................ 11 6.1 Block Diagram Of Test Setup .......................................................... 11 6.2 Limit ................................................................................ 11 6.3 Test procedure ....................................................................... 11 6.4 Test Result .......................................................................... 13 7. RADIATED SPURIOUS EMISSION ................................................... 15 7.1 Block Diagram Of Test Setup .......................................................... 15 7.2 Limit ................................................................................ 15 7.3 Test procedure ....................................................................... 16 7.4 Test Result .......................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 26 8.1 Block Diagram Of Test Setup .......................................................... 26 8.2 Limit ................................................................................ 26 8.3 Test procedure ....................................................................... 26 8.4 Test Result .......................................................................... 27 9. COUDUCTED PEAK OUTPUT POWER ............................................... 34 9.1 Block Diagram Of Test Setup .......................................................... 34 9.2 Limit ................................................................................ 34 9.3 Test procedure ....................................................................... 34 9.4 Test Result .......................................................................... 35 10. 20DB OCCUPIED BANDWIDTH...................................................... 39 10.1 Block Diagram Of Test Setup ......................................................... 39 10.2 Limit ............................................................................... 39 10.3 Test procedure ...................................................................... 39 10.4 Test Result ......................................................................... 39 11. CARRIERFREQUENCIES SEPARATION .............................................. 43 11.1 Block Diagram Of Test Setup ......................................................... 43 11.2 Limit ............................................................................... 43 11.3 Test procedure ...................................................................... 43 11.4 Test Result ......................................................................... 43 12. HOPPING CHANNEL NUMBER ...................................................... 47 12.1 Block Diagram Of Test Setup ......................................................... 47 12.2 Limit ............................................................................... 47 12.3 Test procedure ...........…

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深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 1 OF 11 2.0X1.2X0.6 (mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012- 1) Engineering Specification 1. Product Number YF 2012 H2 P 2G45 00 1 2 3 4 5 6 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 2 OF 11 2. Features *Stable and reliable in performances *Low temperature coefficient of frequency *Low profile, compact size *RoHS compliance *SMT processes compatible 3. Applications *Bluetooth earphone systems *Hand-held devices when WiFi /Bluetooth functions are needed, e.g., Smart phone. *IEEE802.11 b/g/n *ZigBee *Wireless PCMCIA cards or USB dongle 4. Description Yingfeng chip antenna series are specially designed for WiFi/Bluetooth applications. Based on yingfeng proprietary design and processes, this chip antenna has excellent stability and sensitivity to consistently provide high signal reception efficiency. 5. Electrical Specifications (80 x 40 mm 2 ground plane) 5-1. Electrical Table Characteristics Specifications Unit Outline Dimensions 2.0x1.2x0.6 mm Working Frequency 2400~2500 MHz VSWR 2 Max. Impedance 50  Polarization Linear Polarization Gain Peak 2.5 (typical) dBi Efficiency 75 (typical) % 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 3 OF 11 5-2. Return Loss & VSWR Return Loss (S 11 ) VSWR(S 11 ) 6. Antenna Dimensions & Test Board (unit: mm) a. Antenna Dimensions 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 4 OF 11 b. Test Board with Antenna Unit: mm 7. Radiation Pattern (80 x 40 mm 2 ground plane) 7-1. 3D Gain Pattern @ 2442 MHz Z X Y Y X 80 40 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 5 OF 11 7-2. 3D Efficiency Table Frequency( MHz) 2400 2410 2420 2430 2442 2450 2460 2470 2480 2490 2500 Efficiency (dB) -1.4 -1.0 -0.9 -0.7 -0.7 -0.8 -0.9 -1.1 -1.2 -1.3 -1.4 Efficiency (%) 72.8 73.7 74.3 74.4 75.5 75.0 74.0 73.6 73.1 72.6 71.5 Gain (dBi) 2.1 2.2 2.3 2.4 2.5 2.5 2.4 1.8 1.7 1.6 1.4 7-3. 3D Efficiency vs. Frequency Efficiency vs. Frequency 50 60 70 80 90 100 24002410242024302442245024602470248024902500 Frequency(MHz) Efficiency(%) Y X Z X Y Z 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 6 OF 11 8. Layout Guide a. Solder Land Pattern: Land pattern for soldering (gray marking areas) is as shown below. Depending on Customer’s requirement, matching circuit as shown below is also recommended. Top View Bottom View 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 7 OF 11 Unit： mm 9. Frequency tuning a. Chip antenna tuning scenario： b. Matching circuit：(Center frequency is about 2442 MHz @ 80 x 40 mm 2 ground plane) System Matching Circuit Component Location Description Vendor Toleranc e 1 1.2 pF* Murata (0402) ±0.1 pF 2 10PF* Murata(0402) ±0.5 PF 3 N/A* - - Fine tuning element 4 1.5 pF* Murata (0402) ±0.1 pF *Typical reference values which may need to be changed when circuit Matching circuit Feed 4. Fine tuning elemet 1 2 3 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 8 OF 11 boards or part vendors are different. c. Fine tuning element vs. Center frequency 10. Soldering Conditions a. Typical Soldering Profile for Lead-free Process Time 60-180s 60-150s 20- Pre- 150-200° 217°C 260° Temperature (°C) 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 9 OF 11 11. Packing (1) Quantity/Reel: 5000 pcs/Reel (2) Plastic tape: 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 10 OF 11 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOGYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：2.0 x 1.2 x 0.6(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF2012-1) Engineering Specification DOCUMENT YF2012H2P2G4500 REV. NO. C PAGE 11 OF 11

Radiated Emission Below 1G Above 1G Conducted emissions