2AQBD-R51Wireless Transmitter

R50&R51 Operation instruction Model number: R50&R51 Description: Main Features Temperature display format selection (C/F). 3½ digit temperature display, resolution 0.1°C, detection range -50°C--70°C. 2 digit humidity display, resolution 1%, detection range 1%-99%. Maximum 3 RF channels are displayed. Low voltage indication. ASK433MHZ transmission mode. Synchronize the time of the three channels separately (CH1=57S, CH2=67S, CH3=79S). Emitting LED indicator. 2 function buttons. 1 push switch function. Operating instructions After power-on or reset, temperature is detected, data is sent once, and LED flashes synchronously once. Send formats include: temperature, humidity, low voltage, etc. Temperature range -50--+70°C, high temperature over 70°C temperature display HH.H, low temperature over -50 temperature display LL.L. Humidity range: 1%--99%, beyond the range of 1%, 99%. Launch period CH1=57S CH2=67S CH3=79S. Press and hold the "CH" key to power on and let go to RF test mode, in which the transmitter transmits data once per second with LED indication Transmitter test mode is not credited to the synchronization cycle. After selecting the test mode, you need to restart the machine. In the test mode, the temperature and humidity will be continuously detected and emitted. In normal mode, only when the launch, LED prompt, other time LED does not prompt Push switch temperature unit: °C or °F. Key to change the temperature unit: °C or °F. In normal mode: press the key once to change the temperature format Channel selection, by pressing the button or push the switch to select the channel, the display immediately updated, but will not immediately launch the changed channel data, to the internal time to launch. After changing the channel, the synchronous launch time will not be affected Built-in low voltage detection function, no peripheral components, cost saving. When the voltage is lower than the detection range of internal low voltage 2.58V, the low voltage symbol appears, and when it is higher than 2.58V, the low voltage symbol disappears. Detection time: when the emitting LED is on. Manufacturer: FUJIAN YOUTONG INDUSTRIES CO.,LTD. Address: North part of 1st, 2nd~3rd floor, Building 1#, M9511 industries park, No.18, Majiang Road, Mawei DISTRICT, Fuzhou City, Fujian, China FCC STATEMENT 1. 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. 2. 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. FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth foran uncontrolled environment.

Fujian Youtong Industries Co.,Ltd Declaration on model difference Page 1 of 1 page We the undersigned hereby confirm that any of our production units bearing the following model numbers are identical in interior structure, electrical circuits and components, only different in appearance colour and model name. Product Name: Wireless Transmitter Model No.: R50, R51 Sincerely, Signature: Name: Dongsheng Huang Job Title: General Manager Address: North part of 1st, 2nd-3rd floor, Building 1#, M9511 industries Park, No.18, Majiang Road, Mawei District, Fuzhou City, Fujian, China

Fujian Youtong Industries Co.,Ltd Long Term Confidentiality Request Letter 2022-7-4 Eurofins Electrical and Electronic Testing NA, Inc 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Wireless Transmitter / R50, R51/ 2AQBD- R51) 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, Schematic diagram, Operational Description) required to be submitted with this application be permanently withheld from public review. SPECIFY REASON FOR REQUEST (i.e. 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, Signature: Name: Dongsheng Huang Job Title: General Manager Address: North part of 1st, 2nd-3rd floor, Building 1#, M9511 industries Park, No.18, Majiang Road, Mawei District, Fuzhou City, Fujian, China

Fujian Youtong Industries Co.,Ltd Agent Authorization Letter 2022-7-4 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 United Testing Technology Co.,Ltd. to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Signature: Name: Dongsheng Huang Job Title: General Manager Address: North part of 1st, 2nd-3rd floor, Building 1#, M9511 industries Park, No.18, Majiang Road, Mawei District, Fuzhou City, Fujian, China

Model: R51 Model: R51 Model: R51

Wireless Transmitter Model No.: R51 Input: 1.5V*2 AAA battery FCC ID: 2AQBD-R51

Model: R51 Model: R51 Model: R51 Antenna

Page 1 of 20 Report No.: UNIA22071301ER-61 FCC RADIO TEST REPORT FCC ID: 2AQBD-R51 Sample： Wireless Transmitter Trade Name： N/A Main Model： R51 Additional Model： R50 Report No.： UNIA22071301ER-61 Prepared for FUJIAN YOUTONG INDUSTRIES CO., LTD. North part of 1st, 2nd-3rd floor, Building 1#, M9511 industries Park, No.18, Majiang Road, Mawei District, Fuzhou City, Fujian, China Prepared by Shenzhen United Testing Technology Co., Ltd. 2F, Annex Bldg, Jiahuangyuan Tech Park, #365 Baotian 1 Rd, Tiegang Community, Xixiang Str, Bao'an District, Shenzhen, China Page 2 of 20 Report No.: UNIA22071301ER-61 TEST RESULT CERTIFICATION Applicant ............................... : FUJIAN YOUTONG INDUSTRIES CO., LTD. Address .................................. : North part of 1st, 2nd-3rd floor, Building 1#, M9511 industries Park, No.18, Majiang Road, Mawei District, Fuzhou City, Fujian, China Manufacturer ........................ : FUJIAN YOUTONG INDUSTRIES CO., LTD. Address .................................. : North part of 1st, 2nd-3rd floor, Building 1#, M9511 industries Park, No.18, Majiang Road, Mawei District, Fuzhou City, Fujian, China Product description Product ....................................... : Wireless Transmitter Trade Name ........................... : N/A Model Name ........................... : R51, R50 Test Methods ........................ : FCC Part 15 Subpart C 15.231 ANSI C63.10: 2013 This device described above has been tested by Shenzhen United Testing Technology Co., Ltd., and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of UNI, this document may be altered or revised by Shenzhen United Testing Technology Co., Ltd., personnel only, and shall be noted in the revision of the document. Date (s) of performance of tests............. : June 15, 2022 Date of Issue ......................................... : June 16, 2022 Test Result ............................................. : Pass Prepared by: Kahn yang/Supervisor Reviewer: Kelly Cheng/Supervisor Approved & Authorized Signer: Liuze/Manager Page 3 of 20 Report No.: UNIA22071301ER-61 Table of Contents 1 TEST SUMMARY ......................................................................................................................... 4 2 GENERAL INFORMATION .......................................................................................................... 6 2.1 GENERAL DESCRIPTION OF EUT ..................................................................................... 6 2.2 CARRIER FREQUENCY OF CHANNELS ........................................................................... 7 2.3 OPARATION OF EUT DURING TESTING ........................................................................... 7 2.4 DESCRIPTION OF TEST SETUP ........................................................................................ 7 2.5 ENVIRONMENTAL CONDITIONS ....................................................................................... 7 2.6 MEASUREMENT INSTRUMENTS LIST .............................................................................. 8 3 TEST CONDITIONS AND RESULTS .......................................................................................... 9 3.1 RADIATED EMISSION TEST ............................................................................................... 9 3.2 -20DB OCCUPIED BANDWIDTH ........................................................................................ 14 3.3 DEACTIVATION TIME .............................................................................................................. 15 3.4 CALCULATION OF AVERAGE FACTOR........................................................................... 17 3.5 ANTENNA REQUIREMENT ............................................................................................... 19 4 PHOTOGRAPH OF TEST .......................................................................................................... 20 Page 4 of 20 Report No.: UNIA22071301ER-61 1 TEST SUMMARY 1 TEST PROCEDURES AND RESULTS FCC and IC Requirements FCC Part 15.207 Conducted Emission N/A FCC Part 15.231(e) Radiated Emission Compliant FCC Part 15.231(c) 20dB Bandwidth Compliant FCC Part 15.231(e) Release Time Measurement Compliant FCC Part 15.203 Antenna Requirement Compliant The product is aactivated automatically transmitter. 2 TEST FACILITY Test Firm : Shenzhen United Testing Technology Co., Ltd. Address : 2F, Annex Bldg, Jiahuangyuan Tech Park, #365 Baotian 1 Rd, Tiegang Community, Xixiang Str, Bao'an District, Shenzhen, China The testing quality ability of our laboratory meet with "Quality Law of People's Republic of China" Clause 19.The testing quality system of our laboratory meets with ISO/IEC-17025 requirements. This approval result is accepted by MRA of APLAC. Our test facility is recognized, certified, or accredited by the following organizations: A2LA Certificate Number: 4747.01 The EMC Laboratory has been accredited by A2LA, and in compliance with ISO/IEC 17025:2017 General Requirements for testing Laboratories. FCC Registration Number: 674885 The EMC Laboratory has been registered and fully described in a report filed with the (FCC) Federal Communications commission. IC Registration Number: 21947 The EMC Laboratory has been registered and fully described in a report filed with the (IC) Industry Canada. Page 5 of 20 Report No.: UNIA22071301ER-61 3 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence ofapproximately 95 %. A. Radiated Measurement: Test Site Method Measurement Frequency Range U, (dB) NOTE UNI ANSI 9kHz ~ 30MHz 2.50 30MHz ~ 1000MHz 4.80 1000MHz ~ 18000MHz 4.13 Page 6 of 20 Report No.…

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Model: R51 Radiated Emission test