Insteon Leak Sensor
Overview: Long Lasting Battery. Once water activates the two sensors you will get a push notification “Leak Detected” with the Insteon Hub. Most of the time this will happen while on vacation… Great for under sinks, toilets, water heaters, washers, and around sump pumps.
Model# 2852-222 Price $34.99
https://www.smarthome.com/insteon-2852-222-water-leak-sensor.html
Quick Start Guide https://cache-m2.smarthome.com/manuals/2852-222qs.pdf
Manual https://cache-m2.smarthome.com/manuals/2852-x22-en.2-9-2016pdf.pdf