The Auto-Dialer can be hooked up between a phone and a wall jack. When a water sensor detects water, an 85-db alarm is sounded and a wireless signal is sent to the Valve Control Unit to shut-off the water line. Once this is done, the Valve Control Unit sends a wireless signal to the Auto-Dialer to dial the numbers you have programmed into it and alert them of a detected leak and whether the valve was closed successfully or not