Check the listing for details. Samsung SmartThings Water Leak Sensor STS-WTR-250. Condition: Used. Listed at 20.00 USD. The Samsung SmartThings Water Leak Sensor STS-WTR-250 is a ZigBee-enabled device designed to detect water leaks in your home and alert you through the Samsung SmartThings app. It is compatible with the SmartThings platform and requires a battery for power. This sensor provides an added layer of security to your smart home by monitoring for potential water leaks and allowing you to take action quickly to prevent water damage.