Fuers Wireless Water Detectors Battery Operated Leak Alert Water Leak Alarm, 90 dB Alarm Sensor, Sensitive Leak and Drip Alarm, Suitable for Home Use(Shipped Without Battery)-6 Pack - Amazon.com
Tuya Home Smoke Detector WiFi Fire Protection Security Sound Alarm Sensor Wireless Battery Operated Smart Life APP Push Alert - AliExpress
Airthereal Water Leak Detectors, 120dB Adjustable Audio Alarm Sensor, Sensitive Leak and Drip Alert, for Kitchen Bathroom Basement (Battery Included)
Wifi Door Alarm Sensor, Real-time Door Sensor Detector, Smart Window And Door Alarm Work With Tuya App, Door Open Contact Sensor For Home Security And Burglar Alert(without Battery) - Temu