The Open/Close Mini Sensor is a battery powered Z-Wave Plus precise magnetic reed switch that can monitor the status open or closed e.g. doors/windows and anything else that opens and closes. Due to the fact that it offers single function, Open/Close Mini Sensor is highly responsive and reliable. This sensor does more than just monitor if a door or window is opened. With a Z-Wave gateway, the system can respond to real-time events by sending alerts to your smartphone when e.g. the back door is left open.