-Be notified of possible home flooding with this SimpliSafe water sensor -Alerts you whenever it comes into contact with fluid with an audible alert -Place in areas where flooding or water damage may occur -Ready to work right out of the box Your water sensor comes pre-installed with batteries and adhesive -Compatible with your SimpliSafe Gen 3 home security system -Setup is a snap. Place it in the area you want to monitor and 'add device' with your SimpliSafe Keypad -Add up to 100 sensors to the base of your SimpliSafe home security system (Latest generation)