This is a radio controlled switch bundle for the switching of mains power to lighting and appliances up to 250W total load power. The Slave switch operates in conjunction with the Master to provide 2-way light switching for example where you want a switch at the top and bottom of a flight stairs for a particular light. Only the Live wire will be switched to the load. Switching is initiated either by radio control or manually by pressing the button on the housing of either of the switches. It is compatible with Mi |Home Remote Control (MIHO003) and the Mi |Home network. The master switch is a receive-only radio device operating in the 433MHz band. The slave operates by direct connection to the master switch.