The Launch Alert Water Depth Sensor simplifies loading and unloading by transmitting an audible alert when your boat hits the correct depth. The patent-pending system begins with the depth sensor, which is mounted to the frame of the boat trailer at the determined waterline point. When water hits the sensor, a wireless signal is sent to the alarm, which is plugged into the tow vehicle's 12V power outlet. This compact, wireless system comes with battery. Sensor mounts easily and securely with pre-applied adhesive tape.