2A2QO-MBZ212Smart white noise Machine

迈远科技 MBZ212 USER MANUAL 深圳市迈远科技有限公司 Revision History Date Version Modified by Contents 2022-10-08 V1.0 Mars Initial Version 一、 product ID ................................................................................................................................... 3 二、 Parameters .................................................................................................. 错误!未定义书签。 三、 Features ....................................................................................................................................... 3 四、 App ............................................................................................................................................... 3 五、 Buttons definition ..................................................................................... 错误!未定义书签。 六、 Others ........................................................................................................... 错误!未定义书签。 1) Interface definition： ................................................................................................. 错误!未定义书签。 2) Battery ： ..................................................................................................................... 错误!未定义书签。 3) Indicator light function： ......................................................................................... 错误!未定义书签。 深圳市迈远科技有限公司 一、 Product ID 二、 Parameters Working Voltage: 3.7V (supports 2600 rechargeable lithium battery) Dynamic current: Light off < 200mA; Light On < 600 mA Product size: 150*150*32.5mm Speaker: 40mm diameter 4Ω/3W Input AC100 to 240V < 50/60Hz Output DC 5V, 1A 三、 Features 1．Smart white noise sound machine with night light, Tuya solution, tuya wifi module WBR3 built in 2. With 34soothing music built in device ( White noise，Pink noise, Brown noise, wall fan, fan ,floor fan, wind, Canopy, Rain,Thunder, moderate rain，waves, stream，Birds, Crickets, Frogs, Fires, Bonfires, Wombs，Shushu, Cafe，Handbell，Clock，Buddha，Chimes，Ship， Aircraft，train cabin， Lullaby，Music box，Twinkle Twinkle Little Star Morning_Sound，Dream song, Happy song) 3. Night light & environmental atmosphere color light 4. Ac adapter power supply; 5. Touch control to adjust the brightness of light and change light color 6. Support for custom scene mode 深圳市迈远科技有限公司 App function App control to turn on/off music App control to quick switch between the music sources App control to turn on/off light App control to change light color App control to change the brightness of light App control to adjust the volume App control to switch temperature system C/F Time system 12/24 switching is supported 四、 Buttons ① Top Button Short press to switch the scenes, and long press to switch off the light 深圳市迈远科技有限公司 ② Baby cry detection pin Change to temperature detection pin ③ Clock On: The alarm icon is on Off: The alarm icon is off ④ Cry detection icon Change to child locks On: The child lock icon is on Off: The child lock icon is off ⑤ WIFI connection On: The WIFI icon is on Off: The WIFI icon is off ⑥ Clock display panel Default: Displays the time and temperature Low power: LO is displayed Network: ON is displayed When the time is 12 hours, AM/PM is displayed When the time is 24 hours, AM/PM is not displayed Adjust the sound level and light level to display data ⑦ Power button Switch to ON to start the device Switch to OFF to shut down the device ⑧ Alarm button Long press to turn off/on the alarm ⑨ Timer button Short press to display time only Short press to display temperature only Short press to switch time/temperature display Long press to switch time system 12 hours /24 hours 深圳市迈远科技有限公司 ⑩ Previous song Short press to play last song ⑪ Next song Short press to play next song ⑫ M Button Press and hold the M key for 3s to enable network distribution ⑬ Volume+ Short press to increase volume Long press to increase the volume quickly ⑭ volume- Short press to reduce volume Long press to reduce the volume quickly ⑮ RESET Reset device ⑯ Light/Timing Short press to switch the light mode Long press to turn off the timing 30/60/90min ⑰ Timing indicator lights 1.When the timer is 30 minutes, the light is on at 30 minutes 2.When the timer is set to 60 minutes, the indicator is on at 60 minutes 3.When the timer is 90 minutes, the indicator is on at 90 minutes 4.When the clock is not in 30/60/90 minutes timing mode, all three lights are on 深圳市迈远科技有限公司 ⑱ Power indicator light Power on charging: red light Full charge: green Shutdown charging: red light Shutdown charging full: green Low power: The red light blinks ⑲ Charging port Charging device ⑳ Play/Pause Short press to play/pause a song Long press state 1: if the body light is on, long press to adjust the brightness of the light; If the body light is off, long press to adjust the brightness of the clock display panel 21 + Network test Long press the M key + volume + key for 3 seconds to test the network distribution 五、 Others 1) Interface definition: TYPE-C Cable: Charging purpose, lower 1A current, need to do 2-3A current protection Standard 3.5 Audio interface: output high fidelity voice output 2) Battery t uses 1800 battery, and uses USB1A charger for power supply 深圳市迈远科技有限公司 3) Indicator light function When device turned on Charge (red light) - Low battery power Charge (green) - The battery is fully charged When device turned off Charge (red light) - Low battery power Charge (green) - The battery is fully charged 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. § 15.21 Information to user. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. § 15.105 Information to the user. Note: This equipment has been tested and found to comply with the limits for a Class …

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Shenzhen Maiyuan Technology Co., Ltd Model Difference Model: MBZ212, MBZ222, MBZ223, MBZ225, MBZ226, MBZ227, MBZ228, MBZ229, MBZ301, MBZ303MBZ305, MBZ306, MBZ307, MBZ308, MBZ309, MBZ081, MBZ082, MBZ085, MBZ086, MBZ088, MBZ212, MBZ185, MBZ186, MBZ187, MBZ188 All the models are the same circuit and RF module, except the model name. Regards Sincerely, Client’s signature: Client’s name / title : Li Jian/ Manager Contact information / address: B508, Building B, Yuxing Comprehensive Building, Jihua Road, Yousong Community, Longhua Street, Longhua District,shenzhen

Shenzhen Maiyuan Technology Co., Ltd 10/27/2022 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Smart white noise Machine # AND FCC ID: 2A2QO-MBZ212 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 documents are company proprietary information that could never get into the possession of your competition. Please contact me if there is any information you may need. Sincerely, Client’s signature: Client’s name / title : Li Jian/ Manager Contact information / address: B508, Building B, Yuxing Comprehensive Building, Jihua Road, Yousong Community, Longhua Street, Longhua District,shenzhen

Shenzhen Maiyuan Technology Co., Ltd 10/27/2022 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 CTA 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, Client’s signature: Client’s name / title : Li Jian/ Manager Contact information / address: B508, Building B, Yuxing Comprehensive Building, Jihua Road, Yousong Community, Longhua Street, Longhua District,shenzhen

FCC ID: 2A2QO-MBZ212 MBZ212 External Photos of the EUT Photo 1 Photo 2 Photo 3 FCC ID: 2A2QO-MBZ212 Photo 4 Photo 5 Photo 6 FCC ID: 2A2QO-MBZ212 Photo 7

1*1.2cm

FCC ID: 2A2QO-MBZ212 MBZ212 Internal Photos of the EUT Photo 1 Photo 2 Photo 3 FCC ID: 2A2QO-MBZ212 Photo 4 Photo 5 Photo 6 2.4G WIFI (PCB) Antenna FCC ID: 2A2QO-MBZ212 Photo 7 Photo 8 Photo 9 FCC ID: 2A2QO-MBZ212 Photo 10

1. Antenna Description: Antenna type PCB antenna Model MBZ212 Frequency range 2402-2480MHz Manufacturer Shenzhen Maiyuan Technology Co., Ltd ANT Peak Gain 1.97 dBi 2. Antenna Photo: Length :14.48mm Width:5.76mm 3. Test Equipment & Conditions 3.1 Test instrument VSWR is tested using Agilent E5071B connected to a hand mechanism, and the status is free space. 3.2 Test environment and methods 4．Antenna Radiation Pattern 2402MHz 2440MHz 2480MHz

RF Exposure evaluation FCC ID: 2A2QO-MBZ212 Exposure category: General population/uncontrolled environment EUT Type: Production Unit Device Type: Mobile Device 1. Reference According to §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 §1.1310 and §2.1091 RF exposure is calculated. KDB447498 D01: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies 2. Limit Limits for Maximum Permissible Exposure (MPE)/Controlled Exposure Frequency Range(MHz) Electric Field Strength(V/m) Magnetic Field Strength(A/m) Power Density (mW/cm²) Averaging Time (minute) Limits for Occupational/Controlled Exposure 0.3 – 3.0 3.0 – 30 30 – 300 300 – 1500 1500 – 100,000 614 1842/f 61.4 / / 1.63 4.89/f 0.163 / / (100) * (900/f 2 )* 1.0 f/300 5 6 6 6 6 6 Limits for Maximum Permissible Exposure (MPE)/Uncontrolled Exposure Frequency Range(MHz) Electric Field Strength(V/m) Magnetic Field Strength(A/m) Power Density (mW/cm²) Averaging Time (minute) Limits for Occupational/Controlled Exposure 0.3 – 3.0 3.0 – 30 30 – 300 300 – 1500 1500 – 100,000 614 824/f 27.5 / / 1.63 2.19/f 0.073 / / (100) * (180/f 2 )* 0.2 f/1500 1.0 30 30 30 30 30 F=frequency in MHz *=Plane-wave equivalent power density 3. MPE Calculation Method Predication of MPE limit at a given distance Equation from page 18 of OET Bulletin 65, Edition 97-01 S=PG/4πR² Where: S=power density P=power input to antenna G=power gain of the antenna in the direction of interest relative to an isotropic radiator R=distance to the center of radiation of the antenna 4. Antenna Information Briller can only use antennas certificated as follows provided by manufacturer; Antenna No. Model No. of antenna: Type of antenna: Gain of the antenna (Max.) Frequency range: WIFI / PCBANT 1.97dBi for 2400-2500MHz; 5. Manufacturing Tolerance IEEE 802.11b(Average) Frequency (MHz) 2412 2437 2462 Target (dBm) 12.0 12.0 12.0 Tolerance ± (dB) 1.0 1.0 1.0 IEEE 802.11g (Average) Frequency (MHz) 2412 2437 2462 Target (dBm) 11.0 11.0 11.0 Tolerance ± (dB) 1.0 1.0 1.0 IEEE 802.11n VHT20 (Average) Frequency (MHz) 2412 2437 2462 Target (dBm) 11.0 11.0 11.0 Tolerance ± (dB) 1.0 1.0 1.0 6. Standalone MPE Result As declared by the Applicant, the EUT is a wireless device used in a fix application, at least 20 cm from any body part of the user or nearby persons; from the maximum EUT RF output power, the minimum separation distance, r =20cm, the RF power density can be obtained. Modulation Type Output power Antenna Gain (dBi) Antenna Gain (linear) MPE (mW/cm 2 ) MPE Limits (mW/cm 2 ) dBm mW WIFI 13 19.95 1.97 1.57 0.006 1.0000 Remark: 1. Output power (Peak) including turn-up tolerance; 2. MPE evaluate distance is 20cm from user manual provide by manufacturer. 7. Conclusion The measurement results comply with the FCC Limit per 47 CFR 2.1091 for the uncontrolled RF Exposure of mobile device. ----------------THE END OF REPORT---------------

Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao‘an District, Shenzhen, China Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn FCC PART 15 SUBPART C TEST REPORT FCC PART 15.247 Report Reference No. .................... : FCC ID. ........................................... : CTA22102000101 2A2QO-MBZ212 Compiled by ( position+printed name+signature) . : File administrators Zoey Cao Supervised by ( position+printed name+signature) . : Project Engineer Amy Wen Approved by ( position+printed name+signature) . : RF Manager Eric Wang Date of issue .................................... : Oct. 26, 2022 Testing Laboratory Name .............. : Shenzhen CTA Testing Technology Co., Ltd. Address ........................................... : Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Applicant’s name ........................... : Shenzhen Maiyuan Technology Co., Ltd Address ............................................ : B508, Building B, Yuxing Comprehensive Building, Jihua Road, Yousong Community, Longhua Street, Longhua District, Shenzhen, China Test specification ........................... : Standard ........................................... : FCC Part 15.247 TRF Originator.................................. : Shenzhen CTA Testing Technology Co., Ltd. Shenzhen CTA Testing Technology Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen CTA Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen CTA 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. Test item description ..................... : Smart white noise Machine Trade Mark ....................................... : N/A Manufacturer .................................... : Shenzhen Maiyuan Technology Co., Ltd Model/Type reference ...................... : MBZ212 Listed Models .................................. : MBZ222, MBZ223, MBZ225, MBZ226, MBZ227, MBZ228, MBZ229, MBZ301, MBZ303MBZ305, MBZ306, MBZ307, MBZ308, MBZ309, MBZ081, MBZ082, MBZ085, MBZ086, MBZ088, MBZ212, MBZ185, MBZ186, MBZ187, MBZ188 Modulation Type ............................... : CCK/DSSS/OFDM Operation Frequency ....................... : From 2412 - 2462MHz Rating ............................................... : DC 3.7V From Battery and DC 5.0V From external circuit Result ............................................... : PASS Report No.: CTA22102000101 Page 2 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn T E S T R E P O R T Equipment under Test : Smart white noise Machine Model /Type : MBZ212 Series Model No. MBZ222, MBZ223, MBZ225, MBZ226, MBZ227, MBZ228, MBZ229, MBZ301, MBZ303MBZ305, MBZ306, MBZ307, MBZ308, MBZ309, MBZ081, MBZ082, MBZ085, MBZ086, MBZ088, MBZ212, MBZ185, MBZ186, MBZ187, MBZ188 Applicant : Shenzhen Maiyuan Technology Co., Ltd Address : B508, Building B, Yuxing Comprehensive Building, Jihua Road, Yousong Community, Longhua Street, Longhua District, Shenzhen, China Manufacturer : Shenzhen Maiyuan Technology Co., Ltd Address : B508, Building B, Yuxing Comprehensive Building, Jihua Road, Yousong Community, Longhua Street, Longhua District, Shenzhen, China Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: CTA22102000101 Page 3 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Contents 1 T E S T S T A N D A R D S ................................................................. 4 2 S U M M A R Y ............................................................................ 5 2.1 General Remarks 5 2.2 Product Description 5 2.3 Equipment Under Test 5 2.4 Short description of the Equipment under Test (EUT) 5 2.5 EUT operation mode 6 2.6 Block Diagram of Test Setup 6 2.7 Related Submittal(s) / Grant (s) 6 2.8 Modifications 6 3 T E S T E N V I R O N M E N T .............................................................. 7 3.1 Address of the test laboratory 7 3.2 Test Facility 7 3.3 Environmental conditions 7 3.4 Test Description 8 3.5 Statement of the measurement uncertainty 8 3.6 Equipments Used during the Test 9 4 T E S T C O N D I T I O N S A N D R E S U L T S ........................................... 10 4.1 AC Power Conducted Emission 10 4.2 Radiated Emission 13 4.3 Maximum Peak Conducted Output Power 20 4.4 Power Spectral Density 21 4.5 6dB Bandwidth 24 4.6 Out-of-band Emissions 27 4.7 Antenna Requirement 34 5 T E S T S E T U P P H O T O S O F T H E E U T ......................................... 35 6 P H O TOS O F T H E E U T ........................................................... 36 Report No.: CTA22102000101 Page 4 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 1 T E S T S T A N D A R D S The tests were performed according to following standards: FCC Rules Part 15.247: Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands o…

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Report No.: CTA22102000101 Page 29 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 802.11b 802.11g Reference Reference CH011 CH01 30MHz-3GHz 30MHz-3GHz 3GHz -25GHz 3GHz -25GHz Report No.: CTA22102000101 Page 30 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 802.11g Reference Reference CH06 CH11 30MHz-3GHz 30MHz-3GHz 3GHz -25GHz 3GHz -25GHz Report No.: CTA22102000101 Page 31 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 802.11n20 Reference Reference CH01 CH06 30MHz-3GHz 30MHz-3GHz 3GHz -25GHz 3GHz -25GHz Report No.: CTA22102000101 Page 32 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 802.11n20 Reference CH11 30MHz-3GHz 3GHz -25GHz Report No.: CTA22102000101 Page 33 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Band-edge Measurements for RF Conducted Emissions: 802.11b Left bandedge Right bandedge 802.11g Left bandedge Right bandedge 802.11n(HT20) Left bandedge Right bandedge Report No.: CTA22102000101 Page 34 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 4.7 Antenna Requirement Standard Applicable For intentional device, according to FCC 47 CFR Section 15.203: An intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. The use of a permanently attached antenna or of an antenna that uses a unique coupling to the intentional radiator, the manufacturer may design the unit so that a broken antenna can be replaced by the user, but the use of a standard antenna jack or electrical connector is prohibited FCC CFR Title 47 Part 15 Subpart C Section 15.247(c) (1) (I): (i) Systems operating in the 2400-2483.5 MHz band that is used exclusively for fixed. Point-to-point operations may employ transmitting antennas with directional gain greater than 6dBi provided the maximum conducted output power of the intentional radiator is reduced by 1 dB for every 3 dB that the directional gain of the antenna exceeds 6dBi. Test Result: The maximum gain of antenna was 1.97 dBi. Remark:The antenna gain is provided by the customer , if the data provided by the customer is not accurate, Shenzhen CTA Testing Technology Co., Ltd. does not assume any responsibility. Report No.: CTA22102000101 Page 35 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 5 T e s t S e t u p P h o t o s o f t h e E U T Report No.: CTA22102000101 Page 36 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 6 P h o t o s o f t h e E U T Report No.: CTA22102000101 Page 37 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Report No.: CTA22102000101 Page 38 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Report No.: CTA22102000101 Page 39 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Antenna Report No.: CTA22102000101 Page 40 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Report No.: CTA22102000101 Page 41 of 41 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn ********************** End of Report **********************

FCC ID: 2A2QO-MBZ212 MBZ212 Test Setup Photos of the EUT conduction radiation L radiation H