leakSMART™ wireless sensors monitor both moisture & temperature and will signal your Wink Hub / Wink Hub 2 at the first sign of a leak or severe temperature change. LEAK DETECTION Detects water leaks and signals hub in less than 5 seconds. INSTANT ALERTS Receive alerts when a leak or temperature change is detected. TEMPERATURE MONITORING Sensors also monitor temperature for freezing conditions. TO MAKE IT WORK, YOU NEED ONE OF THESE: WINK HUB Allows you to connect this and other products to the Wink app or Relay. WINK HUB 2 Next generation Hub allows you to connect this and other products to the Wink app or Relay.