2AZI3-WD77Water Leak Detector

FCC Warnning: 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 againstharmful interference in a residential installation. This equipment generates, uses and can radiateradio frequency energy and, if not installed and used in accordance with the instructions, maycause harmful interference to radio communications. However, there is no guarantee thatinterference will not occur in a particular installation. If this equipment does cause harmfulinterference to radio or television reception, which can be determined by turning the equipmentoff and on, the user is encouraged to try to correct the interference by one or more of thefollowing 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. Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. 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. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 0cm between the radiator and your body.

FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Appendix III EUT External Photographs Photo 1 Appearance of EUT Photo 2 Appearance of EUT FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Photo 3 Appearance of EUT Photo 4 Appearance of EUT FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Photo 5 Appearance of EUT Photo 6 Appearance of EUT FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Photo 7 Appearance of EUT

FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Appendix IID Label Appendix II ID Label Location FCC ID: 2AZI3-WD77

FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Appendix IV EUT Internal Photographs Photo 8 Internal of EUT Photo 9 Internal of EUT FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Photo 10 Appearance of PCB Photo 11 Appearance of PCB FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Photo 12 Appearance of PCB Antenna

Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202604-0113-2 Page: 1 of 8 TB-RF-073-3.1 1/F., Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China Tel: +86 75526509301 Email: [email protected] www.cotecna-toby.com Maximum Permissible Exposure Evaluation FCC ID: 2AZI3-WD77 Report No. : TBR-C-202604-0113-2 Applicant : SHENZHEN KERUI SMART TECHNOLOGY CO., LTD Equipment Under Test (EUT) EUT Name : Water Leak Detector Model No. : WD77 Series Model No. : N/A Brand Name : STECHRO Sample ID : HC-C-202604-0113-01-01-1#&HC-C-202604-0113-01-01-2# Receipt Date : 2026-04-21 Test Date : 2026-04-21 to 2026-05-27 Issue Date : 2026-05-27 Standards : FCC Part 2.1093 Test Method : KDB 447498 D01 General RF Exposure Guidance v06 Conclusions : PASS In the configuration tested, the EUT complied with the standards specified above. Tested By : Gold. Zhang Reviewed By : Wade. Lv Approved By : Ivan Su This report details the results of the testing carried out on one sample. The results contained in this test report do not relate to other samples of the same product. The manufacturer should ensure that all products in series production are in conformity with the product sample detailed in the report. Report No.: TBR-C-202604-0113-2 Page: 2 of 8 www.cotecna-toby.com TB-RF-073-3.1 CONTENTS CONTENTS ............................................................................................................................................. 2 1. GENERAL INFORMATION ABOUT EUT.............................................................................. 4 1.1 Client Information ................................................................................................................. 4 1.2 General Description of EUT (Equipment Under Test) ................................................... 4 2. MEASUREMENT UNCERTAINTY .......................................................................................... 5 3. TEST FACILITY.......................................................................................................................... 6 4. SAR TEST EXCLUSION CALCULATIONS FOR FCC ....................................................... 7 4.1 FCC: According to 447498 D04 Interim General RF Exposure Guidance v01.......... 7 4.2 Calculation: ........................................................................................................................... 8 Report No.: TBR-C-202604-0113-2 Page: 3 of 8 www.cotecna-toby.com TB-RF-073-3.1 Revision History Report No. Version Description Issued Date TBR-C-202604-0113-2 Rev.01 Initial issue of report 2026-05-27 Report No.: TBR-C-202604-0113-2 Page: 4 of 8 www.cotecna-toby.com TB-RF-073-3.1 1. General Information about EUT 1.1 Client Information Applicant : SHENZHEN KERUI SMART TECHNOLOGY CO., LTD. Address : Room 1501, T2, Jinlitong Building, No. 1100, Xingye Road, Xin'an Street, Bao'an District, Shenzhen, Guangdong, China Manufacturer : SHENZHEN KERUI SMART TECHNOLOGY CO., LTD. Address : Room 1501, T2, Jinlitong Building, No. 1100, Xingye Road, Xin'an Street, Bao'an District, Shenzhen, Guangdong, China 1.2 General Description of EUT (Equipment Under Test) EUT Name : Water Leak Detector Models No. : WD77 Model Different : N/A Product Description : Operation Frequency: 433.92MHz Modulation Type: ASK Max Antenna Gain: -9.52dBi PCB Antenna Power Rating : DC 3V Software Version : N/A Hardware Version : N/A Remark: The above antenna information is declared by manufacturer and for more detailed features description, please refer to the manufacturer's specifications, the laboratory shall not be held responsible. Report No.: TBR-C-202604-0113-2 Page: 5 of 8 www.cotecna-toby.com TB-RF-073-3.1 2. 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 of approximately 95 %. Test Item Parameters Expanded Uncertainty (ULab) Conducted Emission Level Accuracy: 9kHz~150kHz 150kHz to 30MHz ±3.50 dB ±3.10 dB Radiated Emission Level Accuracy: 9kHz to 30 MHz ±4.60 dB Radiated Emission Level Accuracy: 30MHz to 1000 MHz ±4.50 dB Radiated Emission Level Accuracy: Above 1000MHz ±4.20 dB RF Power-Conducted Level Accuracy: Above 1000MHz ±0.95 dB Power Spectral Density- Conducted Level Accuracy: Above 1000MHz ±3dB Occupied Bandwidth Level Accuracy: 30MHz to 1000 MHz Above 1000MHz ±3.8% Unwanted Emission- Conducted Level Accuracy: 30MHz to 1000 MHz Above 1000MHz ±2.72 dB Temperature / ±0.6°C Humidity / ±4% Supply voltages / ±2% Time / ±4% Report No.: TBR-C-202604-0113-2 Page: 6 of 8 www.cotecna-toby.com TB-RF-073-3.1 3. Test Facility The testing report were performed by the Shenzhen Toby Technology Co., Ltd., in their facilities located at 1/F., Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. At the time of testing, the following bodies accredited the Laboratory: CNAS (L5813) The Laboratory has been accredited by CNAS to ISO/IEC 17025: 2017 General Requirements for the Competence of Testing and Calibration Laboratories for the competence in the field of testing. And the Registration No.: CNAS L5813. A2LA Certificate No.: 4750.01 The laboratory has been accredited by American Association for Laboratory Accreditation(A2LA) to ISO/IEC 17025：2017 General Requirements for the Competence of Testing and Calibration Laboratories for the technical competence in the field of Electrical Testing. And the A2LA Certificate No.: 4750.01.FCC Accredited Test Site Number: 854351. Designation Number: CN1223. IC Registration No.: (11950A) The Laboratory has been registered by Certification and Engineering Bureau of Industry Canada for radio equipment testing. The site registration: Site# 11950A. CAB identifier: CN0056. Report No.: TBR-C-202604-0113-2 Page: 7 of 8 www.cotecna-toby.com TB-RF-073-3.1 4. SAR Test Exclusion Calculations for FCC 4.1 FCC: A…

Text truncated - open the document above for the full version.

Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202604-0113-3 Page: 1 of 31 TB-RF-073-3.1 1/F., Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China Tel: +86 75526509301 Email: [email protected] www.cotecna-toby.com RF Test Report FCC ID: 2AZI3-WD77 Report No. : TBR-C-202604-0113-3 Applicant : SHENZHEN KERUI SMART TECHNOLOGY CO., LTD Equipment Under Test (EUT) EUT Name : Water Leak Detector Model No. : WD77 Series Model No. : N/A Brand Name : STECHRO Sample ID : HC-C-202604-0113-01-01-1#&HC-C-202604-0113-01-01-2# Receipt Date : 2026-04-21 Test Date : 2026-04-21 to 2026-05-27 Issue Date : 2026-05-27 Standards : FCC Part 15, Subpart C (15.231(a)) Test Method : ANSI C63.10: 2020+Cor.1:2023+C63.10a:2024 +Errata to C63.10a:2024 Conclusions : PASS In the configuration tested, the EUT complied with the standards specified above, The EUT technically complies with the FCC requirements Tested By : Gold. Zhang Reviewed By : Wade. Lv Approved By : Ivan Su This report details the results of the testing carried out on one sample. The results contained in this test report do not relate to other samples of the same product. The manufacturer should ensure that all products in series production are in conformity with the product sample detailed in the report. Report No.: TBR-C-202604-0113-3 Page: 2 of 31 www.cotecna-toby.com TB-RF-073-3.1 Contents CONTENTS ............................................................................................................................................. 2 1. GENERAL INFORMATION ABOUT EUT.............................................................................. 5 1.1 Client Information ................................................................................................................. 5 1.2 General Description of EUT (Equipment Under Test) ................................................... 5 1.3 Block Diagram Showing the Configuration of System Tested ...................................... 6 1.4 Description of Support Units .............................................................................................. 6 1.5 Description of Test Mode .................................................................................................... 6 1.6 Description of Test Software Setting ................................................................................ 7 1.7 Measurement Uncertainty .................................................................................................. 8 1.8 Test Facility ........................................................................................................................... 9 2. TEST SUMMARY ..................................................................................................................... 10 3. TEST SOFTWARE ................................................................................................................... 10 4. TEST EQUIPMENT AND TEST SITE ................................................................................... 11 5. CONDUCTED EMISSION TEST ........................................................................................... 13 5.1 Test Standard and Limit .................................................................................................... 13 5.2 Test Setup ........................................................................................................................... 13 5.3 Test Procedure ................................................................................................................... 14 5.4 Deviation From Test Standard ......................................................................................... 14 5.5 Test Data ............................................................................................................................. 14 6. RADIATED EMISSION TEST ................................................................................................ 15 6.1 Test Standard and Limit .................................................................................................... 15 6.2 Test Setup ........................................................................................................................... 16 6.3 Test Procedure ................................................................................................................... 18 6.4 Deviation From Test Standard ......................................................................................... 18 6.5 EUT Operating Condition ................................................................................................. 18 6.6 Test Data ............................................................................................................................. 18 7. BANDWIDTH ............................................................................................................................ 19 7.1 Test Standard and Limit .................................................................................................... 19 7.2 Test Setup ........................................................................................................................... 19 7.3 Test Procedure ................................................................................................................... 19 Report No.: TBR-C-202604-0113-3 Page: 3 of 31 www.cotecna-toby.com TB-RF-073-3.1 7.4 Deviation From Test Standard ......................................................................................... 19 7.5 EUT Operating Condition ................................................................................................. 19 7.6 Test Data ............................................................................................................................. 19 8. RELEASE TIME MEASUREMENT ....................................................................................... 20 8.1 Test Standard and Limit ..........…

Text truncated - open the document above for the full version.

8  6KHQ]KHQ /LV\XDQ &RPPXQLFDWLRQ 7HFKQRORJ\ &R /7' :KYZ +W[OVSKTZ )UTJOZOUT 4KZ]UXQ 'TGR_`KXY 1+?9/-.:6' ͭ)USS[TOIGZOUTY :KYZ9KZ 8 9 )3= *)NGSHKX :KYZ9_YZ KS  6XUHK ZKYZ OTMY_YZ KS 8  6KHQ]KHQ /LV\XDQ &RPPXQLFDWLRQ 7HFKQRORJ\ &R /7'  0HFKDQLFDO LQVW UXFWLRQ 8  6KHQ]KHQ /LV\XDQ &RPPXQLFDWLRQ 7HFKQRORJ\ &R /7'  ' GLUHFWLRQ GLDJUDP 8  8  8  8  8  8  6KHQ]KHQ /LV\XDQ &RPPXQLFDWLRQ 7HFKQRORJ\ &R /7' *DLQ (IILFLHQF\ ' 3DWWHUQ )UHTXHQF\ ,' )UHTXHQF\ 0+]  *DLQ G%L     (IILFLHQF\ '%         8  6KHQ]KHQ /LV\XDQ &RPPXQLFDWLRQ 7HFKQRORJ\ &R /7'  8  6KHQ]KHQ /LV\XDQ &RPPXQLFDWLRQ 7HFKQRORJ\ &R /7' 96:5

FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Appendix V EUT Test Photographs Photo of Setup for Radiated Emission (Below 1 GHz) Photo of Setup for Radiated Emission (Above 1 GHz) FCC ID: 2AZI3-WD77 TB-RF-073-3.1 Photo of Setup for Radiated Emission (Above 1 GHz) Photo of Setup for RF Conducted -----END OF THE REPORT-----