The FGD0056 Zone Water Detector is ideal for use in detecting the presence of water on a floor or in a false ceiling. Comes with 10 of WaterRope cable to cover a larger area than a single spot water sensor. It's Normally Closed output may be connected the the input of any Auto Dialer. Powered by 2 AA batteries. Up to 10 lengths of water rope may be connected to create a rope with a maximum length of 100'. Additional Water Ropes are available .