The LEEDARSON Door/Window Sensor is a wireless sensor that is powered by a CR2 battery. The door/window sensor lets you know when a door or window is opened, or closed, and can trigger different actions in response to that open action or close action. This sensor uses the Z-Wave communication module to connect with Z-Wave Gateway. This device can be adapted to use in the EU(868.42Mhz) and US. The door/window sensor supports the Over The Air (OTA) feature for the product’s firmware upgrade. If you want your Door/Window Sensor to be a security device that uses secure/encrypted messages to communicate in a Z-Wave network, then a security enabled Z-Wave controller/gateway is needed.