Monnit Wireless Sensors are an ecosystem of 50+ sensor types that detect changes in variables. These variables include temperature, water presence, door position, electrical current, and voltages. Employ to an autonomous wireless sensing solution that protects your bottom line. The devices have a superior wireless range with 1000+ ft. of non-line-of sight through 12-14 walls. And, a long battery life ensures 10+ years of use powered by 2 "AA" batteries.