Monnit ALTA Wireless Water Detection Sensor offers a wireless range of 1200+ feet through 12+ walls and 2VDC to 3.8VDC supply voltage. This sensor detects when water is present by complete the circuit between the two leaded wires. When water is detected, the sensor will immediately turn on the RF radio and transmit the data to the wireless gateway and iMonnit Online Sensor Monitoring and Notification System, giving the user an immediate SMS text or email alert. The ALTA sensor can also be configured to detect the non-presence of water. Monnit ALTA Wireless Water Detection Sensor is ideal for water heater monitoring, plumbing leak detection, sump monitoring, and reservoir level monitoring.