The SmartWise RF DW2+ is an enhanced wireless door/window sensor that is compatible with Sonoff's smart home product line. It can detect and act as an action trigger for both opening and closing of the door or window, and can connect to other Sonoff smart devices via wireless RF technology. It comes with a built-in antenna and double-sided adhesive for easy installation. The sensor operates on one CR2032 type 12V battery (not included) and can transmit up to a maximum of 200m in an open area.