Is this sensor compatible with your system? Click here to confirm sensor compatibility. Add-on Sensors are compatible across most La Crosse View systems. Check the compatibility chart link above to confirm. Note: Not every display will have enough fields on the display itself to show all sensor data, but, when connected to Wi-Fi, the data is passed through the display and, with the La Crosse View App, the system makes your smart device your display wherever you are. Features: Detects the presence of water Ambient Temperature (°F or °C) BLUE LED: Normal Transmission. The LED light will occasionally flash blue, indicating it is still transmitting correctly and that no water has been detected. RED LED: Water detected. The LED light will flash red twice every 5 seconds until dry. PURPLE LED: Battery is low Specifications: 0.031 inches when flat, 0.25 inches when vertical Ambient Temperature Range: -40°F to 140°F (-40°C to 60°C) Up to 400 feet (121 meters) in open air, RF 915 MHz Power requirements: 2 "AA" Alkaline batteries (not included) Dimensions: 3.54" L x 1.22" W x 4.72" H