The Automatic system will shut your water off if flow exceeds the time you set on the control panel. The water will also shut off if the inside temperature falls below 45 degrees or the electric power is lost. The water will remain turned off until you check for leaks and then touch the "reset" button on the control panel. The water will also shut off if there is no water use for three days (NOAH assumes you left on vaction). The by-pass valves will allow access to water in case of a power outage when the city water supply is still usable. 25' cable included.(other lengths available. Advise if new construction or "retro" box is desired. Also see item 001 for additional features. Allow 30 days for delivery.