FloodStop (FS 3/8-C) automatically shuts off the water supply to the Dishwasher or Toilet, whether caused by a small continuous leak, broken component, leaking seal, overflow or a ruptured supply line.Powered by AC adapter/Transformer and 4 AA Batteries as a battery backup in case of a power outage, or the batteries may serve as the sole power source if theres no nearby electrical outlet to utilize the transformer. The controller will beep to alert you of low or no batteries.The controller has "one" output contact (normally open) that can be connected to an Alarm, Home Automation or Auto-Dialer systems if desired. Easily installed in ten minutes. 1-Year Manufacturer's Warranty.