2AFSG-F30MelodyFlow

DongguanJin wen hua digitaltechnologyCo., LTD. Date: 2022-03-02 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject; Request for Long Term Confidentiality FCC ID: 2AFSG-F30 To WhomIt May Concern, Pursuantto the provisionsof the Commission’s rules Title 47 Sections§0.457 and §0.459,we are requestingthe Commissionto withholdthe followingattachment(s)as confidential documentsfrom public disclosureindefinitely. Thesedocumentscontaindetailedsystemand equipmentdescriptionsand are consideredas proprietaryinformationin operationof the equipment.The public disclosureof these documents might be harmfulto our companyand would give competitorsan unfair advantagein the market. SchematicDiagram Block Diagram Parts List OperationalDescription Tune-upProcedure It is our understandingthat all measurementtest reports,FCC ID label formatand correspondenceduringthe certificationreviewprocesscannotbe grantedas confidential documentsand this informationwill be availablefor public reviewonce the grant of equipment authorizationis issued. Sincerely, Signature: Name:Luo Peng Title: Manager

Dongguan Jin wen hua digital technology Co., LTD. NO.1 Hua Da Road, Long Bei Ling Village, Tangxia, Town, Dongguan City, Guangdong, China Agent Authorization Company: Dongguan Jin wen hua digital technology Co., LTD. Address: NO.1 Hua Da Road, Long Bei Ling Village, Tangxia, Town, Dongguan City, Guangdong, China Product Name: MelodyFlow Model Number(s): F30 Product Description: MelodyFlow We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature:Date:20 22-03-02 Name:Luo Peng Title:Manager Company:DongguanJin wen hua digitaltechnologyCo., LTD.

Page 1 of 4 Appendix C: Photographs of EUT Product: MelodyFlow Model: F30 External Photos Page 2 of 4 Page 3 of 4 Page 4 of 4

LabelArtworkandLocation Model:F30 Label: Size:L*W=60*35mm MelodyFlow Model:F30 FCCID ： 2AFSG-F30 Thisdevicecomplieswithpart15oftheFCCrules. Operationissubjecttothefollowingtwoconditions (1)thisdevicemaynotcauseharmfulinterference, and(2)thisdevicemustacceptanyinterference received,includinginterferencethatmaycause undesiredoperation. Location

Page 1 of 4 Appendix C: Photographs of EUT Product: MelodyFlow Model: F30 Internal Photos Page 2 of 4 Antenna Page 3 of 4 Page 4 of 4

Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................ : 2AFSG-F30 Test Report No. ............... : TCT220224E034 Date of issue ................... : Mar. 01, 2022 Testing laboratory .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: TCT Testing Industrial Park Fuqiao 5th Industrial Zone, Fuhai Street, Bao'an District Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : 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's name ... : Dongguan Jin wen hua digital technology Co., LTD. Address ........................... : NO.1 Hua Da Road, Long Bei Ling Village, Tangxia Town, Dongguan City, Guangdong, China Standard(s) ..................... : FCC CFR Title 47 Part 1.1307 Test item description ..... : MelodyFlow Trade Mark ...................... : CHIFENCHY Model/Type reference..... : F30 Rating(s).......................... : Rechargeable Li-ion Battery DC 7.4V Date of receipt of test item ......................................... : Feb. 24, 2022 Date (s) of performance of test ................................... : Feb. 24, 2022 - Mar. 01, 2022 Tested by (+signature) ... : John WEN Check by (+signature) .... : Beryl ZHAO Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT220224E034 Page 2 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information .................................................................. 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list ............................................................................................................ 3 2. General Information ................................................................................. 4 2.1. Test environment and mode ................................................................................. 4 2.2. Description of Support Units ................................................................................ 4 3. Facilities and Accreditations .................................................................. 5 3.1. Facilities ................................................................................................................. 5 3.2. Location ................................................................................................................. 5 4. Test Results and Measurement Data ..................................................... 6 Report No.: TCT220224E034 Page 3 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Test item description ........... : MelodyFlow Model/Type reference........... : F30 Sample Number....................: TCT220224E033-0101 Operation Frequency ........... : 2402MHz~2480MHz Modulation Type ................... : GFSK, π/4-DQPSK, 8DPSK Antenna Type ........................ : PCB Antenna Antenna Gain ........................ : 0dBi Rating(s)................................ : Rechargeable Li-ion Battery DC 7.4V Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list None. Report No.: TCT220224E034 Page 4 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 2. General Information 2.1. Test environment and mode Item Normal condition Temperature +25ºC Voltage DC 7.4V Humidity 56% Atmospheric Pressure: 1008 mbar Test Mode: Engineering mode: Keep the EUT in continuous transmitting by select channel 2.2. Description of Support Units The EUT has been tested as an independent unit together with other necessary accessories or support units. The following support units or accessories were used to form a representative test configuration during the tests. Equipment Model No. Serial No. FCC ID Trade Name / / / / / Note: 1. All the equipment/cables were placed in the worst-case configuration to maximize the emission during the test. 2. Grounding was established in accordance with the manufacturer’s requirements and conditions for the intended use. 3. For conducted measurements (Output Power, 20dB Occupied Bandwidth, Carrier Frequencies Separation, Hopping Channel Number, Dwell Time, Spurious Emissions), the antenna of EUT is connected to the test equipment via temporary antenna connector, the antenna connector is soldered on the antenna port of EUT, and the temporary antenna connector is listed in the Test Instruments. Report No.: TCT220224E034 Page 5 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 3. Facilities and Accreditations 3.1. Facilities The test facility is recognized, certified, or accredited by the following organizations: ● FCC - Registration No.: 645098 SHENZHEN TONGCE TESTING LAB Designation Number: CN1205 The testing lab has been registered and fully described in a report with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in our files. ● IC - Registration No.: 10668A-1 SHENZHEN TONGCE TESTING LAB CAB identifier: CN0031 The testing lab has been registered by Certification and Engineering Bureau of Industry Canada for radio equipment testing. 3.2. Location SHENZHEN TONGCE TESTING LAB Address: TCT Testing Industrial Park Fuqiao 5th Industrial Zone, Fuhai Street,…

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Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................. : 2AFSG-F30 Test Report No. ............... : TCT220224E033 Date of issue ................... : Mar. 01, 2022 Testing laboratory. .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: TCT Testing Industrial Park Fuqiao 5th Industrial Zone, Fuhai Street, Bao'an District Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : 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's name. ..... : Dongguan Jin wen hua digital technology Co., LTD. Address ........................... : NO.1 Hua Da Road, Long Bei Ling Village, Tangxia Town, Dongguan City, Guangdong, China Standard(s) ...................... : FCC CFR Title 47 Part 15 Subpart C Section 15.247 FCC KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.10:2013 Test item description ...... : MelodyFlow Trade Mark ....................... : CHIFENCHY Model/Type reference ..... : F30 Rating(s) .......................... : Rechargeable Li-ion Battery DC 7.4V Date of receipt of test item .......................................... : Feb. 24, 2022 Date (s) of performance of test ................................... : Feb. 24, 2022 - Mar. 01, 2022 Tested by (+signature) .... : John WEN Check by (+signature) .... : Beryl ZHAO Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT220224E033 Page 2 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information .................................................................. 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list ............................................................................................................ 3 1.3. Operation Frequency ............................................................................................ 3 2. Test Result Summary .............................................................................. 4 3. General Information ................................................................................. 5 3.1. Test environment and mode ................................................................................. 5 3.2. Description of Support Units ................................................................................ 5 4. Facilities and Accreditations .................................................................. 6 4.1. Facilities ................................................................................................................. 6 4.2. Location ................................................................................................................. 6 4.3. Measurement Uncertainty ..................................................................................... 6 5. Test Results and Measurement Data ..................................................... 7 5.1. Antenna requirement ............................................................................................ 7 5.2. Conducted Emission ............................................................................................. 8 5.3. Conducted Output Power ................................................................................... 12 5.4. 20dB Occupy Bandwidth .................................................................................... 13 5.5. Carrier Frequencies Separation ......................................................................... 14 5.6. Hopping Channel Number .................................................................................. 15 5.7. Dwell Time ............................................................................................................ 16 5.8. Pseudorandom Frequency Hopping Sequence ................................................ 17 5.9. Conducted Band Edge Measurement ................................................................ 18 5.10.Conducted Spurious Emission Measurement .................................................. 19 5.11.Radiated Spurious Emission Measurement ..................................................... 20 Appendix A: Test Result of Conducted Test Appendix B: Photographs of Test Setup Appendix C: Photographs of EUT Report No.: TCT220224E033 Page 3 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Test item description ........... : MelodyFlow Model/Type reference........... : F30 Sample Number....................: TCT220224E033-0101 Bluetooth Version ................ : V5.3 Operation Frequency ........... : 2402MHz~2480MHz Transfer Rate ........................ : 1/2/3 Mbits/s Number of Channel .............. : 79 Modulation Type ................... : GFSK, π/4-DQPSK, 8DPSK Modulation Technology ....... : FHSS Antenna Type ........................ : PCB Antenna Antenna Gain ........................ : 0dBi Rating(s)................................ : Rechargeable Li-ion Battery DC 7.4V Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list None. 1.3. Operation Frequency Channel Frequency Channel Frequency Channel Frequency Channel Frequency 0 2402MHz 20 2422MHz 40 2442MHz 60 2462MHz 1 2403MHz 21 2423MHz 41 2443MHz 61 2463MHz ... ... ... ... ... ... ...…

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Report No.: TCT220224E033 Page 61 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 3-DH1 2402MHz Hopping Ref Band Edge(Hopping) NVNT 3-DH1 2402MHz Hopping Emission Report No.: TCT220224E033 Page 62 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band Edge(Hopping) NVNT 3-DH1 2480MHz Hopping Ref Band Edge(Hopping) NVNT 3-DH1 2480MHz Hopping Emission Report No.: TCT220224E033 Page 63 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Conducted RF Spurious Emission Condition Mode Frequency (MHz) Max Value (dBc) Limit (dBc) Verdict NVNT 1-DH1 2402 -45.68 -20 Pass NVNT 1-DH1 2441 -42.16 -20 Pass NVNT 1-DH1 2480 -43.21 -20 Pass NVNT 2-DH1 2402 -43.57 -20 Pass NVNT 2-DH1 2441 -39.4 -20 Pass NVNT 2-DH1 2480 -42.66 -20 Pass NVNT 3-DH1 2402 -41.71 -20 Pass NVNT 3-DH1 2441 -44.97 -20 Pass NVNT 3-DH1 2480 -44.16 -20 Pass Report No.: TCT220224E033 Page 64 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Test Graphs Tx. Spurious NVNT 1-DH1 2402MHz Ref Tx. Spurious NVNT 1-DH1 2402MHz Emission Report No.: TCT220224E033 Page 65 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 1-DH1 2441MHz Ref Tx. Spurious NVNT 1-DH1 2441MHz Emission Report No.: TCT220224E033 Page 66 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 1-DH1 2480MHz Ref Tx. Spurious NVNT 1-DH1 2480MHz Emission Report No.: TCT220224E033 Page 67 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 2-DH1 2402MHz Ref Tx. Spurious NVNT 2-DH1 2402MHz Emission Report No.: TCT220224E033 Page 68 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 2-DH1 2441MHz Ref Tx. Spurious NVNT 2-DH1 2441MHz Emission Report No.: TCT220224E033 Page 69 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 2-DH1 2480MHz Ref Tx. Spurious NVNT 2-DH1 2480MHz Emission Report No.: TCT220224E033 Page 70 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 3-DH1 2402MHz Ref Tx. Spurious NVNT 3-DH1 2402MHz Emission Report No.: TCT220224E033 Page 71 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 3-DH1 2441MHz Ref Tx. Spurious NVNT 3-DH1 2441MHz Emission Report No.: TCT220224E033 Page 72 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Tx. Spurious NVNT 3-DH1 2480MHz Ref Tx. Spurious NVNT 3-DH1 2480MHz Emission Report No.: TCT220224E033 Page 73 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Number of Hopping Channel Condition Mode Hopping Number Limit Verdict NVNT 1-DH1 79 15 Pass NVNT 2-DH1 79 15 Pass NVNT 3-DH1 79 15 Pass Report No.: TCT220224E033 Page 74 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Test Graphs Hopping No. NVNT 1-DH1 2441MHz Hopping No. NVNT 2-DH1 2441MHz Report No.: TCT220224E033 Page 75 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Hopping No. NVNT 3-DH1 2441MHz Report No.: TCT220224E033 Page 76 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell Time Condition Mode Frequency (MHz) Pulse Time (ms) Total Dwell Time (ms) Burst Count Period Time (ms) Limit (ms) Verdict NVNT 1-DH1 2441 0.2 63.6 318 31600 400 Pass NVNT 1-DH3 2441 1.62 260.82 161 31600 400 Pass NVNT 1-DH5 2441 2.87 307.09 107 31600 400 Pass NVNT 2-DH1 2441 0.38 120.84 318 31600 400 Pass NVNT 2-DH3 2441 1.63 260.8 160 31600 400 Pass NVNT 2-DH5 2441 2.88 308.16 107 31600 400 Pass NVNT 3-DH1 2441 0.38 121.6 320 31600 400 Pass NVNT 3-DH3 2441 1.63 260.8 160 31600 400 Pass NVNT 3-DH5 2441 2.88 305.28 106 31600 400 Pass Report No.: TCT220224E033 Page 77 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Test Graphs Dwell NVNT 1-DH1 2441MHz One Burst Dwell NVNT 1-DH1 2441MHz Accumulated Report No.: TCT220224E033 Page 78 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 1-DH3 2441MHz One Burst Dwell NVNT 1-DH3 2441MHz Accumulated Report No.: TCT220224E033 Page 79 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 1-DH5 2441MHz One Burst Dwell NVNT 1-DH5 2441MHz Accumulated Report No.: TCT220224E033 Page 80 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 2-DH1 2441MHz One Burst Dwell NVNT 2-DH1 2441MHz Accumulated Report No.: TCT220224E033 Page 81 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 2-DH3 2441MHz One Burst Dwell NVNT 2-DH3 2441MHz Accumulated Report No.: TCT220224E033 Page 82 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 2-DH5 2441MHz One Burst Dwell NVNT 2-DH5 2441MHz Accumulated Report No.: TCT220224E033 Page 83 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 3-DH1 2441MHz One Burst Dwell NVNT 3-DH1 2441MHz Accumulated Report No.: TCT220224E033 Page 84 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 3-DH3 2441MHz One Burst Dwell NVNT 3-DH3 2441MHz Accumulated Report No.: TCT220224E033 Page 85 of 95 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Dwell NVNT 3-DH5 2441MHz One Burst Dwell NVNT 3-DH5 2441MHz Accumulated Report No.: TCT220224E033 Page 86 of 95 Hotline: 400-6611-140 Tel: 86-755-27673…

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Page 1 of 2 Appendix B: Photographs of Test Setup Product: MelodyFlow Model: F30 Radiated Emission Page 2 of 2 Conducted Emission