The Powermaster Switch 1G 2Way is commonly used in situations where a light or other electrical device needs to be controlled from two different places, such as a hallway or staircase. It's a single gang switch, meaning it occupies one slot in a switch plate, and is a two-way switch. When one switch is turned on, the other switch can turn the circuit off, and vice versa. This type of switch is usually wired using a three-core cable, and it can be easily identified by the presence of two brass terminals on the back of the switch.