2BA2B-WD21Wireless Microphone

English User Manual WD21 Wireless Microphone Live Streaming RecordingVideo ShootingOnline Teaching 2 . Product Overview This is a wireless lavalier microphone, which can provide professional recording output. It has high quality audio and high stability wireless reception performance. In addition, plug and play, no APP needed. This product can be used in various scenarios, such as: network broadcast, video shooting, program interview, interview recording, online teaching and other wireless sound transmission fields. It should be noted that the connection may be blocked by obstacles, affected by electronic interference, or interrupted due to over-distance. Please read this user manual carefully before using the product to ensure correct, safe usage and keep it in good condition. . Packing List Transmitter ×1 Receiver ×1 Storage bag ×1 Charging cable ×1 User manual ×1 . Product Diagram Power Button Multifunctional Button Transmitter Indicator Light Charging Port / Type-C Earphone Jack ( Plug in earphone for monitoring ) Microphone Sound Pickup Hole Microphone Clip Lightning Connection Port Receiver Indicator Light Charging Adapter ( The connected device can be charged through the adapter ) . Usage and Operation 1. Product Usage Instructions Step 1: Plug the receiver into the lightning port of iPhone or tablet and the receiver indicator light keeps flashing in red. Step 2: Press and hold the power button on the transmitter for 3 seconds and the transmitter indicator light flashes red and blue alternately. Step 3: When the indicator light on transmitter keeps on purple and the indicator light on receiver keeps on red, which means the device is connected successfully. NOTE: 1.This product is applicable to iPhone & Lightning interface tablets. If you want to connect Android devices, please purchase the corresponding adaptor separately. 2.Make sure that the screen of the connected device is lit up when using it, otherwise the device can not supply power to the receiver, which will cause the receiver to shut down. 2. Function Description . Product Specifications 1.Model: WD21 2.Transmission protocol: 2.4G protocol 3.Transmission distance: ≥ 20 meters ( In open space) 4.Real time monitoring: support (Suitable for Type-C port earphones ) 5.Noise reduction: support 6.Reverberation effect: support 7.Sound latency: ≤25ms 8.Microphone: -38dB±3dB Omnidirectional 9.Frequency response range: 20Hz-20KHz 10.Sampling rate: 44.1KHz 11.SNR: ≥70dB 12.Battery capacity: 80mAh 13.Working time: 8 hours 14.Input: 5V50mA 15.Charging port: Type-C 16.Charging time: 1.5 hours 17.Working temperature: -5―50 . Safety Notes 1.This product is a precision electronic device. Please avoid water ingress or heavy drops and do not use the product in a humid and dusty environment. 2.The product is powered by rechargeable lithium battery. If the product is not used for a long time, please fully charge it every 3 months to ensure battery performance. 3.Please clean the product with a clean, soft, and dry cloth. 4.Do not place the product in an extreme environment, otherwise, it may be temporarily unavailable for use. The normal use temperature is -5°C to 50°C. 5.Use the transmitter and receiver face to face as much as possible, otherwise the signal transmission may be affected, resulting in short signal distance or signal breakpoints. .FCC Warning Statement Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 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. 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. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. 3 . Product Overview This is a wireless lavalier microphone, which can provide professional recording output. It has high quality audio and high stability wireless reception performance. In addition, plug and play, no APP needed. This product can be used in various scenarios, such as: network broadcast, video shooting, program interview, interview recording, online teaching and other wireless sound transmission fields. It should be noted that the connection may be blocked by obstacles, affected by electronic interference, or interrupted due to over-distance. Please read this user manual carefully before using the product to ensure correct, safe usage and keep it in good condition. . Packing List Transmitter ×1 Receiver ×1 Storage bag ×1 Charging cable ×1 User manual ×1 . Product Diagram Power Button Multifunctional Button Transmitter Indicator Light Charging Port / Type-C Earphone Jack ( Plug in earphone for monitoring ) Microphone Sound Pickup Hole Microphone Clip Lightning Conne…

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Shenzhen jinhongfeng Technology Co.,ltd 2.911 (d)(5)(i) Equipment Type Attestation v1.2 Section 2.911(d)(5)(i) Certification – EquipmentType Company name: Shenzhen jinhongfeng Technology Co.,ltd Address: Room 1-028, Shidai Jiaozi Building, No. 2032, Nanshan Avenue, Dawangshan Community, Nantou Street, Nanshan District, Shenzhen, 518000, China Product Name: Wireless Microphone FCCID: 2BA2B-WD21 Model(s): WD21, WD22, WD23 2.911(d)(5)(i) EquipmentType We, [Shenzhen jinhongfeng Technology Co.,ltd] (“the applicant”) certify that the equipment for which authorization is sought through certification is not:  Prohibited from receiving an equipment authorization pursuant to § 2.903; of the FCC rules.  Identified as an equipment type in the “Covered List” NOTE 1 Yours sincerely, Name: Macro Liu Date: Apr. 27, 2023 Title: Manager Company name: Shenzhen jinhongfeng Technology Co.,ltd Signature: NOTE 1 “Covered List ”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

Shenzhen jinhongfeng Technology Co.,ltd 2.911 (d)(5)(ii) Applicant Attestation v1.3 Section 2.911(d)(5)(ii) Certification – Applicant (Covered List ) Company name: Shenzhen jinhongfeng Technology Co.,ltd Address: Room 1-028, Shidai Jiaozi Building, No. 2032, Nanshan Avenue, Dawangshan Community, Nantou Street, Nanshan District, Shenzhen, 518000, China Product Name: Wireless Microphone FCCID: 2BA2B-WD21 Model(s): WD21, WD22, WD23 2.911(d)(5)(ii) Applicant filing We, [Shenzhen jinhongfeng Technology Co.,ltd] (“the applicant”) certify that, as of the date of the filing of the application, the applicant is not identified NOTE 1 on the “Covered List” NOTE 2 , established pursuant to §1.50002 of this chapter, as an entity producing covered communications equipment. Yours sincerely, Name: Macro Liu Date: Apr. 27, 2023 Title: Manager Company name: Shenzhen jinhongfeng Technology Co.,ltd Signature: NOTE 1 Delete option not applicable to this application. NOTE 2 “Covered List ”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

Shenzhen jinhongfeng Technology Co.,ltd Agent Authorization Company: Shenzhen jinhongfeng Technology Co.,ltd Address: Room 1-028, Shidai Jiaozi Building, No. 2032, Nanshan Avenue, Dawangshan Community, Nantou Street, Nanshan District, Shenzhen, 518000, China Product Name: Wireless Microphone Model Number(s): WD21, WD22, WD23 Product Description: Wireless Microphone 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: Apr. 27, 2023 Name: Macro Liu Title: Manager Company: Shenzhen jinhongfeng Technology Co.,ltd

Shenzhen jinhongfeng Technology Co.,ltd Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: Apr. 27, 2023 Subject; Request for Confidentiality FCC ID: 2BA2B-WD21 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuantto KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Macro Liu Title: Manager

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Annex A External Photos Report No.:HK2304191533-E Page 1 of 4 Report No.:HK2304191533-E Page 2 of 4 Report No.:HK2304191533-E Page 3 of 4 Report No.:HK2304191533-E Page 4 of 4

FCC ID LABEL: Ca. 10mm x 20mm label location FCC ID: 2BA2B-WD21

Annex B Internal Photos Report No.:HK2304191533-E Page 1 of 3 Antenna Report No.:HK2304191533-E Page 2 of 3 Report No.:HK2304191533-E Page 3 of 3

FCC RF Exposure EUT Description: Wireless Microphone Model No.: WD21 FCC ID: 2BA2B‐WD21 1. Limits According to KDB 447498 D01 General RF Exposure Guidance v06 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: Result=P/D*√F F= the RF channel transmit frequency in GHz P=Maximum turn‐up power in mw D=Min. test separation distance in mm 2. Test Result of RF Exposure Evaluation 2480MHz: EIRP(dBm)=101.73(dBuV/m)-95.3=6.43(dBm) Frequency (MHz) Output power (dBm) Tune Up Power (dBm) Max Tune Up power dBm/mW Min test separatio n distance mm Result Limit (mW/cm 2 ) SAR Test Exclusion 2480 6.43 5.7±1 6.7/4.677 5 1.473 3.0 Pass Note: PK Output power= conducted power. Conducted power see the test report HK2304191533‐E, antenna gain= 1.75dBi Per KDB 447498 D01, when the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine RF Exposure test exclusion. The test exclusion threshold is 1.473 which is<= 3, RF Exposure testing is not required. Note: Exclusion Thresholds Results=[(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ·[√f (GHz)] f(GHz) is the RF channel transmit frequency in GHz Distance=5mm

承 認 書 SPECIFICATION FOR APPROVAL 客戶名稱 CUSTOMER ： 客戶料號 CUSTOMER’S P/N ： 料號 PART NUMBER ： WAN3216F245H08 規格 DESCRIPTION ： Chip Antenna 3216 L Ant 2.45G Type H08 版本 VERSION ： V1.1 日期 ISSUE DATE ： 2020/02/27 客 戶 承 認 CUSTOMER APPROVED 工 程 部 R&D CENTER 承 認 APPROVAL 確 認 CHECKED 製 作 DRAWN Ray Tennyson Snow 萬誠科技股份有限公司 OneWave Electronic Co., Ltd. 11261台北市北投區立功街151號1樓 1F, No. 151, Li Gong Street, Beitou District, Taipei City 11261, Taiwan 電話: (02) 2898-2220 TEL: +886 2 2898-2220 傳真: (02) 2898-5055 FAX: +886 2 2898-5055 2/11 ONEWAVE TECHNOLOGY CO., LTD. 3216 Chip antenna For Bluetooth / WLAN Applications Dimension (mm) L 3.23 ± 0.20 W 1.66 ± 0.20 T 0.45 ± 0.20 P/N: WAN3216F245H08 3/11 ONEWAVE TECHNOLOGY CO., LTD. Part Number Information WAN 3216 F 245 H 08 A B C D E F A Product Series Antenna B Dimension L x W 3.2 x 1.6mm (±0.2mm) C Material High K material D Working Frequency 2.4 ~ 2.5GHz E Feeding mode PIFA & Single Feeding F Antenna type Type = 08 1. Electrical Specification Remark : Bandwidth & Peak Gain was measured under evaluation board of next page Specification Part Number WAN3216F245H08 Central Frequency 2450 MHz Bandwidth 120 (Min.) MHz Return Loss -6.5 (Max) dB Peak Gain 1.75 dBi Impedance 50 Ohm Operating Temperature -40～+110 °C Maximum Power 4 W Resistance to Soldering Heats 10 ( @ 260°C) sec. Polarization Linear Azimuth Beamwidth Omni-directional Termination Ni / Au (Leadless) 4/11 ONEWAVE TECHNOLOGY CO., LTD. 2. Recommended PCB Pattern Evaluation Board Dimension 2 nd Evaluation Board Dimension Suggested Matching Circuit 重要資訊 : 匹配元件建議使用精準度高的電感±0.1~0.3nH、電容±0.1pF 5/11 ONEWAVE TECHNOLOGY CO., LTD. Layout Dimensions in Clearance area( Size=5.9*5.0mm) FootPrint (Unit : mm) ◆ 2 nd Layout Dimensions in Clearance area( Size=8.0*3.0mm) Matching Circuit 50 ohm transmission Line 6/11 ONEWAVE TECHNOLOGY CO., LTD. 3. Measurement Results Return Loss 7/11 ONEWAVE TECHNOLOGY CO., LTD. Radiation Pattern Efficiency Peak Gain Directivity 2400MHz 81.46% 1.67 dBi 2.56 dBi 2450MHz 84.75% 1.75 dBi 2.46 dBi 2500MHz 82.68% 1.70 dBi 2.52 dBi Chamber Coordinate System X Y Z 8/11 ONEWAVE TECHNOLOGY CO., LTD. 4.Reliability and Test Condictions ITEM REQUIREMENTS TEST CONDITION Solderability 1. Wetting shall exceed 90% coverage 2. No visible mechanical damage Pre-heating temperature:150°C/60sec. Solder temperature:230±5°C Duration:4±1sec. Solder:Sn-Ag3.0-Cu0.5 Flux for lead free: rosin Solder heat Resistance 1. No visible mechanical damage 2. Central Freq. change :within ± 6% 10 ± 0.5 sec. 60 sec . . T E M P ( °C ) 150 °C 2 6 0 °C Pre-heating temperature:150°C/60sec. Solder temperature:260±5°C Duration:10±0.5sec. Solder:Sn-Ag3.0-Cu0.5 Flux for lead free: rosin Component Adhesion (Push test) 1. No visible mechanical damage The device should be reflow soldered(230±5°C for 10sec.) to a tinned copper substrate A dynometer force gauge should be applied the side of the component. The device must with-ST-F 0.5 Kg without failure of the termination attached to component. Component Adhesion (Pull test) 1. No visible mechanical damage Insert 10cm wire into the remaining open eye bend ,the ends of even wire lengths upward and wind together. Terminal shall not be remarkably damaged. Thermal shock 1. No visible mechanical damage 2. Central Freq. change :within ±6% Phase Temperature(°C) Time(min) 1 +110±5°C 30±3 2 Room Temperature Within 3sec 3 -40±2°C 30±3 4 Room Temperature Within 3sec +110°C=>30±3min -40°C=>30±3min Test cycle:10 cycles The chip shall be stabilized at normal condition for 2~3 hours before measuring. Resistance to High Temperature 1. No visible mechanical damage 2. Central Freq. change :within ±6% 3. No disconnection or short circuit. Temperature: +110±5°C Duration: 1000±12hrs The chip shall be stabilized at normal condition for 2~3 hours before measuring. Resistance to Low Temperature 1. No visible mechanical damage 2. Central Freq. change :within ±6% 3. No disconnection or short circuit. Temperature:-40±5°C Duration: 1000±12hrs The chip shall be stabilized at normal condition for 2~3 hours before measuring. Humidity 1. No visible mechanical damage 2. Central Freq. change :within ±6% 3. No disconnection or short circuit. Temperature: 40±2°C Humidity: 90% to 95% RH Duration: 1000±12hrs The chip shall be stabilized at normal condition for 2~3 hours before measuring. 4±1 sec. 60sec TEMP (°C) 150°C 230°C 9/11 ONEWAVE TECHNOLOGY CO., LTD. 5.Soldering and Mounting Mildly activated rosin fluxes are preferred. The minimum amount of solder can lead to damage from the stresses caused by the difference in coefficients of expansion between solder, chip and substrate. The terminations are suitable for all wave and re-flow soldering systems. If hand soldering cannot be avoided, the preferred technique is the utilization of hot air soldering tools. Recommended temperature profiles for re-flow soldering in Figure 1. Products attachment with a soldering iron is discouraged due to the inherent process control limitations. In the event that a soldering iron must be employed the following precautions are recommended. ‧Preheat circuit and products to 150°C ‧Never contact the ceramic with the iron tip ‧Use a 20 watt soldering iron with tip diameter of 1.0mm ‧280°C tip temperature (max) ‧1.0mm tip diameter (max) ‧Limit soldering time to 3 sec. SOLDERING COOLING NATURAL PRE-HEATING TEMPERATURE(°C) 60~120 s 10s max. 30~60s 250~260 230 180 150 TIME(sec.) Reflow Soldering SOLDERING COOLING NATURAL PRE-HEATING TEMPERATURE(°C) within 3s Gradual cooling 150 TIME(sec.) Iron Soldering Over 60s 350 300 10/11 ONEWAVE TECHNOLOGY CO., LTD. 6.Packaging Information Tape Specification: Reel Specification: (7’’, Φ180 mm) Tape Width(mm) A(mm) B(mm) C(mm) D(mm) Chip/Reel(pcs) 8 9.0±0.5 60±2 13.5±0.5 178±2 3000 11/11 ONEWAVE TECHNOLOGY CO., LTD. 7.Storage and Transportation Information Storage Conditions To maintain the solderability of terminal electrodes: 1. Temperature and humidity conditions: -10~ 40°C and 30~70% RH. 2. Recommended products shoul…

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Page 1 of 28 Report No.: HK2304191533-E FCC Test Report Test Report On Behalf of Shenzhen jinhongfeng Technology Co.,ltd For Wireless Microphone Model No.: WD21, WD22, WD23 FCC ID: 2BA2B-WD21 Prepared For: Shenzhen jinhongfeng Technology Co.,ltd Room 1-028, Shidai Jiaozi Building, No. 2032, Nanshan Avenue, Dawangshan Community, Nantou Street, Nanshan District, Shenzhen, 518000, China Prepared By: Shenzhen HUAK Testing Technology Co., Ltd. 1-2/F., Building B2, Junfeng Zhongcheng Zhizao Innovation Park, Heping, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Date of Test: Apr. 19, 2023 ~Apr. 25, 2023 Date of Report: Apr. 25, 2023 Report Number: HK2304191533-E Page 2 of 28 Report No.: HK2304191533-E Test Result Certification Applicant’s Name ................. : Shenzhen jinhongfeng Technology Co.,ltd Address ................................. : Room 1-028, Shidai Jiaozi Building, No. 2032, Nanshan Avenue, Dawangshan Community, Nantou Street, Nanshan District, Shenzhen, 518000, China Manufacture's Name ............ : Shenzhen jinhongfeng Technology Co.,ltd Address ................................. : Room 1-028, Shidai Jiaozi Building, No. 2032, Nanshan Avenue, Dawangshan Community, Nantou Street, Nanshan District, Shenzhen, 518000, China Product Description Trade Mark ................................ : N/A Product Name ........................... : Wireless Microphone Model and/or Type Reference: WD21, WD22, WD23 Standards ............................. : FCC Rules and Regulations Part 15 Subpart C Section 15.249 ANSI C63.10: 2013 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Date of Test ............................................ : Date (s) of Performance of Tests ............ : Apr. 19, 2023 ~ Apr. 25, 2023 Date of Issue ........................................... : Apr. 25, 2023 Test Result .............................................. : Pass Testing Engineer : (Gary Qian) Technical Manager : (Eden Hu) Authorized Signatory : (Jason Zhou) Page 3 of 28 Report No.: HK2304191533-E Table of Contents Page 1 . Test Summary 5 1.1 . Test Procedures and Results 5 1.2 . Information of the Test Laboratory 5 1.3 . Measurement Uncertainty 5 2 . General Information 6 2.1 . General Description of EUT 6 2.2 . Operation of EUT during Testing 7 2.3 . Description of Test Setup 8 2.4 . Measurement Instruments List 9 3 . Conducted Emissions Test 10 3.1. Conducted Power Line Emission Limit 10 3.2. Test Setup 10 3.3. Test Procedure 10 3.4. Test Result 11 4. Radiated Emission Test 13 4.1. Radiation Limit 13 4.2. Test Setup 13 4.3. Test Procedure 14 4.4. Test Result 14 5. Band Edge 20 5.1. Limits 20 5.2. Test Procedure 20 5.3. Test Result 21 6. Occupied Bandwidth Measurement 23 6.1. Test Setup 23 6.2. Test Procedure 23 6.3. Measurement Equipment Used 23 6.4. Test Result 23 7. Antenna Requirement 25 8. Photograph of Test 26 9. Photos of the EUT 28 Page 4 of 28 Report No.: HK2304191533-E ** Modified History ** Revision Description Issued Data Remark Revision 1.0 Initial Test Report Release Apr. 25, 2023 Jason Zhou Page 5 of 28 Report No.: HK2304191533-E 1. Test Summary 1.1. Test Procedures and Results DESCRIPTION OF TEST SECTION NUMBERRESULT CONDUCTED EMISSIONS TEST 15.207 COMPLIANT RADIATED EMISSION TEST 15.249(a)/15.209 COMPLIANT BAND EDGE 15.249(d)/15.205 COMPLIANT OCCUPIED BANDWIDTH MEASUREMENT 15.215(c) COMPLIANT ANTENNA REQUIREMENT 15.203 COMPLIANT 1.2. Information of the Test Laboratory Shenzhen HUAK Testing Technology Co., Ltd. Add.: 1-2/F., Building B2, Junfeng Zhongcheng Zhizao Innovation Park, Heping, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Testing Laboratory Authorization： A2LA Accreditation Code is 4781.01. FCC Designation Number is CN1229. Canada IC CAB identifier is CN0045. CNAS Registration Number is L9589. 1.3. Measurement Uncertainty Measurement Uncertainty Conducted Emission Expanded Uncertainty =2.71dB, k=2 Radiated emission expanded uncertainty(9kHz-30MHz) = 3.90dB, k=2 Radiated emission expanded uncertainty(30MHz-1000MHz)= 3.90dB, k=2 Radiated emission expanded uncertainty(Above 1GHz) = 4.28dB, k=2 Page 6 of 28 Report No.: HK2304191533-E 2. General Information 2.1. General Description of EUT Equipment: Wireless Microphone Model Name: WD21 Series Model: WD22, WD23 Model Difference: All model's the function, software and electric circuit are the same, only with product model named different. Test sample model: WD21. FCC ID: 2BA2B-WD21 Antenna Type: Ceramic Antenna Antenna Gain: 1.75dBi Operation Frequency: 2402-2480MHz Number of Channels: 79CH Modulation Type: GFSK Power Source: DC 3.7V from Battery or DC 5V from Type-C Power Rating: DC 3.7V from Battery or DC 5V from Type-C Page 7 of 28 Report No.: HK2304191533-E 2.1.1. Carrier Frequency of Channels Channel Frequency (MHz) Channel Frequency (MHz) Channel Frequency (MHz) 1 2402 28 2429 55 2456 2 2403 29 2430 56 2457 3 2404 30 2431 57 2458 4 2405 31 2432 58 2459 5 2406 32 2433 59 2460 6 2407 33 2434 60 2461 7 2408 34 2435 61 2462 8 2409 35 2436 62 2463 9 2410 36 2437 63 2464 10 2411 37 2438 64 2465 11 2412 38 2439 65 2466 12 2413 39 2440 66 2467 13 2414 40 2441 67 2468 14 2415 41 2442 68 2469 15 2416 42 2443 69 2470 16 2417 43 2444 70 2471 17 2418 44 2445 71 2472 18 2419 45 2446 72 2473 19 2420 46 2447 73 2474 20 2421 47 2448 74 2475 21 2422 48 2449 75 2476 22 2423 49 2450 76 2477 23 2424 50 2451 77 2478 24 2425 51 2452 78 2479 25 2426 52 2453 79 2480 26 2427 53 2454 27 2428 54 2455 2.2. Operation of EUT during Testing Operating Mode The mode is used: Transmitting mode Low Channel: 2402MHz Middle Channel: 2441MHz High Channel: 2480MHz Page 8 of 28 Rep…

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Report No.: HK2304191533-E Radiated Emissions Report No.: HK2304191533-E Conducted Emission