Text extracted from the exhibit documents filed with the FCC. Open a document above to read the original.
WoTanNiChang(Shanghai)TechnologyCo.,Ltd. Room205-01,Building25,No.695LingshiRoad,JinganDistrict,Shanghai200072,China Date:2026-01-31 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Ref:AttestationStatementsPart2.911(d)(5)(i)Filing FCCID:2BUFN-RIFFMATE ToWhomItMayConcern: WoTanNiChang(Shanghai)TechnologyCo.,Ltd.certifiesthattheequipmentforwhichauthorizationissought isnotācoveredāequipmentprohibitedfromreceivinganequipmentauthorizationpursuanttosection2.903of theFCCrules. WoTanNiChang(Shanghai)TechnologyCo.,Ltd.certifiesthattheequipmentforwhichauthorizationissought doesnotincludecybersecurityoranti-virussoftwareproducedorprovidedbyKasperskyLab,Inc.oranyofits successorsandassignees,includingequipmentwithintegratedKasperskyLab,Inc.(oranyofitssuccessors andassignees)cybersecurityoranti-virussoftwarepursuanttoDA-24-886andKDB986446D01Covered EquipmentGuidancesectionB(2a). Deviceisinherentlycompliantbasedonhardwarelimitationsorsoftwarecontrols. or ASoftwareBillofMaterials(SBOM)isprovidedtotheTCBforreview,and Theend-userorthirdpartiescannotinstalladditionalsoftwareonthisdevice. Sincerely, Signatory [WenjuanQiu,HumanResourceManager]
WoTanNiChang(Shanghai)TechnologyCo.,Ltd. Room205-01,Building25,No.695LingshiRoad,JinganDistrict,Shanghai200072,China Date:2026-01-31 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Ref:AttestationStatementsPart2.911(d)(5)(ii)Filing FCCID:2BUFN-RIFFMATE ToWhomItMayConcern: WoTanNiChang(Shanghai)TechnologyCo.,Ltd.certifiesthat,asofthedateofthefilingoftheapplication,the applicantisnotidentifiedontheCoveredList(asaspecificallynamedentityoranyofitssubsidiariesor affiliates)asanentityproducingācoveredāequipment. Sincerely, Signatory [WenjuanQiu,HumanResourceManager]
WoTanNiChang(Shanghai)TechnologyCo.,Ltd. Room205-01,Building25,No.695LingshiRoad,JinganDistrict,Shanghai200072,China Date:2026-01-31 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA FCCID:2BUFN-RIFFMATE ApplicantFRN:0037869625 USAgentāAttestationStatement/Part2.911(d)(7) WoTanNiChang(Shanghai)TechnologyCo.,Ltd.certifiesthat,asof2026-01-31,wehave designatedFCCUSAgent,LLCtoacceptserviceofprocessonourbehalfforFCCID: 2BUFN-RIFFMATE. WoTanNiChang(Shanghai)TechnologyCo.,Ltd.,acceptstomaintainanagentofserviceof processintheUnitedStatesfornolessthanoneyearaftereitherthegranteehaspermanently terminatedallmarketingandimportationoftheapplicableequipmentwithintheU.S.,orthe conclusionofanyCommission-relatedadministrativeorjudicialproceedinginvolvingthe equipment,whicheverislater. FCCUSAgent,LLC,acceptsasofthedateofthefilingofthisapplication,theobligationof beingthedesignatedagentforthepurposeofacceptingserviceofprocessonbehalfofWo TanNiChang(Shanghai)TechnologyCo.,Ltd.forFCCID:2BUFN-RIFFMATE. DesignatedAgentInformation: CompanyName:FCCUSAgent,LLC U.S.AgentFRN:0033402884 Address:3722IllinoisAvenue,SaintCharles,IL,60174,USA ContactPerson:TimPayne Phone:708-571-3148 Email:[email protected] Sincerely, Company:WoTanNiChang(Shanghai) TechnologyCo.,Ltd. DesignatedAgent:FCCUSAgent,LLC CompanyRepresentative:WenjuanQiuDesignatedAgentRepresentative:TimPayne Signature:Signature:
WoTanNiChang(Shanghai)TechnologyCo.,Ltd. Room205-01,Building25,No.695LingshiRoad,JinganDistrict,Shanghai200072,China Date:2026-01-31 FEDERALCOMMUNICATIONSCOMMISSION AUTHORIZATIONANDEVALUATIONDIVISION 7435OAKLANDMILLSROAD COLUMBIA,MD21046 SUBJECT:FCCApplicationforFCCID:2BUFN-RIFFMATE ConfidentialityRequest Towhomitmayconcern, PursuanttotheprovisionsoftheCommissionāsrulesTitle47SectionsĀ§0.457andĀ§0.459,wearerequestingthe Commissiontowithholdthefollowingattachment(s)asconfidentialdocumentsfrompublicdisclosureindefinitely. ā BlockDiagram ā Tune-UpInformation ā OperationalDescription,SBOM ā SecurityInformation ā Schematics ā SoftwareDefinedRadio(SDR)Information ā PartsList Theabovematerialscontaintradesecretsandproprietaryinformationnotcustomarilyreleasedtothepublic.The publicdisclosureofthesematerialsmaybeharmfultotheapplicantandprovideunjustifiedbenefitstoits competitors. Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketingregulationsinTitle47CFR Ā§2.803andtheimportationrulesinTitle47CFRĀ§2.1204,whileensuringthatbusinesssensitiveinformation remainsconfidentialuntiltheactualmarketingofnewlyauthorizeddevices,werequestShortTermConfidentiality ofthefollowingattachment(s); ā ExternalPhotos ā TestSetupPhotos ā InternalPhotos ā UserManual āFor45days,pursuanttoPublicNoticeDA04-1705. or āFor180dayspursuanttoKDB726920D01. TheapplicantunderstandsthatpursuanttoSection0.457oftheRules,disclosureofthisapplicationandall accompanyingdocumentationwillnotbemadebeforethedateoftheGrantforthisapplication. Sincerely, Signatory [WenjuanQiu,HumanResourceManager]
WoTanNiChang(Shanghai)TechnologyCo.,Ltd. Room205-01,Building25,No.695LingshiRoad,JinganDistrict,Shanghai200072,China Date:2026-01-31 FEDERALCOMMUNICATIONSCOMMISSION AUTHORIZATIONANDEVALUATIONDIVISION 7435OAKLANDMILLSROAD COLUMBIA,MD21046 SUBJECT:FCCApplicationforFCCID:2BUFN-RIFFMATE POWEROFATTORNEY ToWhomItMayConcern: We,theundersigned,herebyauthorizeWaltekTestingGroup(Shenzhen)Co.,Ltd.JandySoonourbehalf,to applytotheFederalCommunicationsCommissiononourequipment.AnyandallactscarriedoutbyWaltek TestingGroup(Shenzhen)Co.,Ltd.JandySoonourbehalfshallhavethesameeffectasactsofourown. ThisistoadvisethatweareinfullcompliancewiththeAnti-DrugAbuseAct.We,WoTanNiChang(Shanghai) TechnologyCo.,Ltd.arenotsubjecttoadenialoffederalbenefitspursuanttoSection5301oftheAnti-Drug Actof1988,21USC853a,andnopartytotheapplicationissubjecttoadenialoffederalbenefitspursuantto thatsection. Sincerely, Signatory [WenjuanQiu,HumanResourceManager]
Reference No.: WTX25X11304859W001/002 Page 1 of 14 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn ANNEX EXHIBIT 1 - PRODUCT LABELING Proposed FCC ID Label Format FCC ID: 2BUFN-RIFFMATE 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. Specifications: The label shall be securely affixed to a permanently attached part of the device, in a location where it is visible or easily accessible to the user, and shall not be readily detachable. The label shall be sufficiently durable to remain fully legible and intact on the device in all normal conditions of use throughout the deviceās expected lifetime. Proposed Label Location on EUT FCC ID Label Location
1. RF Exposure Requirements 1.1 General Information Client Information Applicant: Wo Tan Ni Chang(Shanghai)Technology Co.,Ltd. Address of applicant: Room 205-01,Building 25,No.695 Lingshi Road, Jingan District, Shanghai. Manufacturer: Wo Tan Ni Chang(Shanghai)Technology Co.,Ltd. Address of manufacturer: Room 205-01,Building 25,No.695 Lingshi Road, Jingan District, Shanghai. General Description of EUT: Product Name: RIFFMATE Intelligent Guitar Trade Name / Model No.: RIFFMATE0001 Adding Model(s): / Rated Voltage: Type-C: DC5V, 9V, 12V, 15V, 20V Battery: 14.6V Battery Capacity: 2350mAh Adapter Model: / FCC ID: 2BUFN-RIFFMATE Equipment Type: Portable device Technical Characteristics of EUT: Bluetooth Bluetooth Version: V5.3 (BR/EDR mode) Frequency Range: 2402-2480MHz RF Output Power: 1.99dBm (Conducted) Data Rate: 1Mbps, 2Mbps, 3Mbps Modulation: GFSK, Ļ/4 DQPSK, 8DPSK Quantity of Channels: 79 Channel Separation: 1MHz Type of Antenna: PCB Antenna Antenna Gain: 2.54dBi Bluetooth Bluetooth Version: V5.3 (LE mode) Frequency Range: 2402-2480MHz RF Output Power: 3.40dBm (Conducted) Data Rate: 1Mbps Modulation: GFSK Quantity of Channels: 40 Channel Separation: 2MHz Type of Antenna: PCB Antenna Antenna Gain: 2.54dBi 1.2 RF Exposure Exemption According to Ā§1.1307(b)(3) and KDB 447498 D04 Interim General RF Exposure Guidance v01, system operating under the provisions of this section shall be operating in a manner that the public is not exposed to radio frequency energy level in excess limit for maximum permissible exposure. Option A: FCC Rule Part 1.1307 (b)(3)(i)(A):The available maximum time-averaged power is no more than 1mW, regardless of separation distance. Option B: FCC Rule Part 1.1307 (b)(3)(i)(B): The available maximum time-averaged power or effective radiated power (ERP), whichever is greater, is less than or equal to the threshold P th (mW) described in the following formula. P th is given by: Option C: FCC Rule Part 1.1307 (b)(3)(i)(C): The minimum separation distance (R in meters) from the body of a nearby person for the frequency (f in MHz) at which the source operates, the ERP (watts) is no more than the calculated value prescribed for that frequency. R must be at least Ī»/2Ļ, where Ī» is the free-space operating wavelength in meters. Single RF Sources Subject to Routine Environmental Evaluation RF Source frequency (MHz) Threshold ERP (watts) 0.3-1.34 1,920 R 2 1.34-30 3,450 R 2 /f 2 30-300 3.83 R 2 300-1,500 0.0128 R 2 f 1,500-100,000 19.2R 2 For Multiple RF sources: FCC Rule Part 1.1307(b)(3)(ii): (A) The available maximum time-averaged power of each source is no more than 1 mW and there is a separation distance of two centimeters between any portion of a radiating structure operating and the nearest portion of any other radiating structure in the same device, except if the sum of multiple sources is less than 1 mW during the time-averaging period, in which case they may be treated as a single source (separation is not required). (B) In the case of fixed RF sources operating in the same time-averaging period, or of multiple mobile or portable RF sources within a device operating in the same time averaging period, if the sum of the fractional contributions to the applicable thresholds is less than or equal to 1 as indicated in the following equation. 1.3 Calculated Result Radio Access Technology Prediction Frequency Output Power Antenna Gain Duty Cycle Tune-Up Time-Averaged Power ERP (MHz) (dBm) (dBi) (%) (dBm) (dBm) Bluetooth 2402 3.40 2.54 100 4.00 4.39 Frequency Option Min. Distance Max. Power Exposure Limit Ratio Result (MHz) (cm) (dBm) (mW) (mW) Pass/Fail 2402 B 0.5 4.39 2.75 2.788 0.99 Pass Note: 1. Time-Averaged Power=Output Power * Duty Cycle; ERP= Time-Averaged Power+ Antenna gain-2.15dB 2. Option A, B and C refers as clause 1.2. 3. For option B, Max (time-averaged power, effective radiated power (ERP)) converts to Max. Power. For option C, ERP converts to Max. Power; 4. For option B, P th (mW) converts to Exposure Limit (mW); For option C, ERP (W) converts to Exposure Limit (mW). 5. Ratio= Tune-Up ERP (mW)/ Exposure Limit (mW) Mode for Simultaneous Multi-band Transmission: Radio Access Technology Ratio 1 Ratio 2 Simultaneous Ratio Limit Result Pass/Fail -- -- -- -- -- -- Result: Pass
Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 1 of 39 TEST REPORT Reference No. ....................: WTX25X11304859W002 FCC ID ............................... .: 2BUFN-RIFFMATE Applicant .......................... .: Wo Tan Ni Chang(Shanghai)Technology Co.,Ltd. Address ............................ .: Room 205-01,Building 25,No.695 Lingshi Road, Jingan District, Shanghai. Manufacturer .................... .: The same as Applicant Address ............................ .: The same as Applicant Product Name .................. .: RIFFMATE Intelligent Guitar Model No.. ......................... .: RIFFMATE0001 Standards ......................... .: FCC Part 15.247 Date of Receipt sample ... .: 2025-11-19 Date of Test....................... .: 2025-12-08 to 2025-12-15 Date of Issue .................... .: 2025-12-17 Test Report Form No. ...... . : WTX_Part 15_247W Test Result ........................ .: Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of approver. Prepared By: Waltek Testing Group (Shenzhen) Co., Ltd. Address: 1/F., Room 101, Building 1, Hongwei Industrial Park, Liuxian 2nd Road, Block 70 Bao'an District, Shenzhen, Guangdong, China Tel.: +86-755-33663308 Fax.: +86-755-33663309 Email: [email protected] Tested by: Approved by: Tris Li/Project Engineer Jason Su/Manager Reference No.: WTX25X11304859W002 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 2 of 39 TABLE OF CONTENTS 1. GENERAL INFORMATION .................................................................................................................................... 4 1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ......................................................................... 4 1.2 TEST STANDARDS ................................................................................................................................................. 5 1.3 TEST METHODOLOGY ........................................................................................................................................... 5 1.4 TEST FACILITY ...................................................................................................................................................... 5 1.5 EUT SETUP AND TEST MODE .............................................................................................................................. 6 1.6 MEASUREMENT UNCERTAINTY ............................................................................................................................. 7 1.7 TEST EQUIPMENT LIST AND DETAILS ................................................................................................................... 8 2. SUMMARY OF TEST RESULTS ......................................................................................................................... 12 3. ANTENNA REQUIREMENT ................................................................................................................................. 13 3.1 STANDARD APPLICABLE ..................................................................................................................................... 13 3.2 EVALUATION INFORMATION ................................................................................................................................ 13 4. POWER SPECTRAL DENSITY ........................................................................................................................... 14 4.1 STANDARD APPLICABLE ..................................................................................................................................... 14 4.2 TEST SETUP BLOCK DIAGRAM ........................................................................................................................... 14 4.3 TEST PROCEDURE .............................................................................................................................................. 14 4.4 SUMMARY OF TEST RESULTS/PLOTS ................................................................................................................. 14 5. DTS BANDWIDTH ................................................................................................................................................. 15 5.1 STANDARD APPLICABLE ..................................................................................................................................... 15 5.2 TEST SETUP BLOCK DIAGRAM ........................................................................................................................... 15 5.3 TEST PROCEDURE .............................................................................................................................................. 15 5.4 SUMMARY OF TEST RESULTS/PLOTS ................................................................................................................. 15 6. RF OUTPUT POWER ............................................................................................................................................ 16 6.1 STANDARD APPLICABLE ..................................................................................................................................... 16 6.2 TEST SETUP BLOCK DIAGRAM ........................................................................................................................... 16 6.3 TEST PROCEDURE .............................................................................................................................................. 16 6.4 SUMMARY OF TEST RESULTS/PLOTS ................................................................................................................. 16 7. FIELD STRENGTH OF SPURIOUS EMISSIONS ........ā¦
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Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 1 of 13 TEST REPORT Reference No. .................... : WTX25X11304859W Applicant ........................... : Wo Tan Ni Chang(Shanghai)Technology Co.,Ltd. Address ............................. : Room 205-01,Building 25,No.695 Lingshi Road, Jingan District, Shanghai. Manufacturer ..................... : The same as Applicant Address ............................. : The same as Applicant Product Name ................... : RIFFMATE Intelligent Guitar Model No... ......................... : RIFFMATE0001 Standards .......................... : ANSI/ IEEE 149-2021 Date of Receipt sample .... : 2025-11-19 Date of Test........................ : 2025-12-08 to 2025-12-15 Date of Issue ..................... : 2025-12-17 Test Report Form No. ....... : WTX_IEEE 149 Test Result ......................... : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of approver. Prepared By: Waltek Testing Group (Shenzhen) Co., Ltd. Address: 1/F., Room 101, Building 1, Hongwei Industrial Park, Liuxian 2nd Road, Block 70 Bao'an District, Shenzhen, Guangdong, China Tel.: +86-755-33663308 Fax.: +86-755-33663309 Email: [email protected] Tested by: Approved by: Tris Li/Project Engineer Jason Su/Manager Reference No.: WTX25X11304859W Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 2 of 13 TABLE OF CONTENTS 1.GENERAL INFORMATION .................................................................................................................................... 4 1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ............................................................................... 4 2. SUMMARY OF TEST RESULTS ........................................................................................................................... 5 3. ANTENNA TEST CONFIGURATIONS ................................................................................................................ 6 3.1 TEST LOCATION ..................................................................................................................................................... 6 3.2 TEST ENVIRONMENTS............................................................................................................................................. 6 3.3 TEST EQUIPMENT LIST ........................................................................................................................................... 6 3.4 MEASUREMENT UNCERTAINTY .............................................................................................................................. 6 3.5 TEST SETUP ............................................................................................................................................................ 6 4. ANTENNA TEST RESULT ..................................................................................................................................... 7 4.1 GAIN AND EFFICIENCY ........................................................................................................................................... 7 4.2 RADIATION PATTERN 2D VIEW ............................................................................................................................... 8 4.3 RADIATION PATTERN 3D VIEW ............................................................................................................................. 10 EXHIBIT 1 - EUT PHOTOGRAPHS ........................................................................................................................ 12 EXHIBIT 2 - TEST SETUP PHOTOGRAPHS ........................................................................................................ 13 Reference No.: WTX25X11304859W Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 3 of 13 Report version Version No. Date of issue Description Rev.00 2025-12-17 Original / / / Reference No.: WTX25X11304859W Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 4 of 13 1.GENERAL INFORMATION 1.1 Product Description for Equipment Under Test (EUT) General Description of EUT Product Name: RIFFMATE Intelligent Guitar Trade Name: / Model No.: RIFFMATE0001 Adding Model(s): / Note: The test data is gathered from a production sample, provided by the manufacturer. Technical Characteristics of EUT Frequency Range: 2400-2500MHz Gain of Antenna: 2.54dBi (Max.) Type of Antenna: PCB Antenna Dimension: Reference No.: WTX25X11304859W Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 5 of 13 2. SUMMARY OF TEST RESULTS Standards Description of Test Item Result ANSI/ IEEE 149-2021 IEEE Recommended Practice for Antenna Measurements Compliant N/A: not applicable Reference No.: WTX25X11304859W Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 6 of 13 3. Antenna Test Configurations 3.1 Test Location Name: Sushi TOWE Wireless Testing(Shenzhen)Co., Ltd. Address: F 401/101, Building E, Hongwei Industrial Zone, No. 6, Liuxian 3rd Road, Bao'an District, Shenzhen,518133 3.2 Test Environments Environments Parameter Temperature Voltage Humidit NTNV 25ļ° C -- 50% 3.3 Test Equipment List Description Manufacturer Model Serial Number Cal. Date Due. Date Anechoic Chamber ETS AMS8923 Q2225 2023-06-09 2028-06-08 RF Switch ETS EMCenter 251211 / / Vector network analyzer R&S ZNB8 101413 2025-07-15 2026-07-14 3.4 Measurement Uncertainty The uncertainty is calculated using the methods suggested in theāGuide to the Expression of Uncertainty in Measurement" (GUM) published by ISO. When the test result is a critical value,we will use the measurement uncertainty give the judgment result based on the 95%Confidence intervals. 3.5 Test Setup Refereā¦
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3722 Illinois Avenue, Saint Charles, Ā· Saint Charles, Illinois, 60174 Ā· United States
| # | Rule Parts | Frequency Range | Power Output |
|---|---|---|---|
| 1 | 15C | 2.40 GHz - 2.48 GHz | 2.20 mW |