This is a z-wave insert module designed for a 3-wire system
The ZME_05457 Z-wave.me wall controller is a switch for loads up to 2300Watt. Its a complete set, with pushbutton and mountingframe in Duro 2000 series (pearl white). You can control the switch via the pushbutton or via a z-wave device. The 2 colored led gives status information. This is module for a 3 wires system, which means that the device needs a blue wire in the wall box.