Wireless sensors are compatible with the MarCELL Cellular Connected Monitoring System. The wireless sensors allow you to monitor your home environment in multiple zones up to 250 feet away depending on construction or building materials. Wireless Water Sensors monitor for water leaks or flooding. Simply place these small, battery powered wireless sensors behind toilets, under sinks, near the sump pump or hot water heater to be alerted immediately if a leak is detected. Sensors include a replaceable coin cell battery that lasts up to five years.