Also known as three-way switches, these are often used in large, open workspaces and can be wired on opposite ends of the room to control lights on the same circuit. They work in pairs to control lights from two different locations. To prevent accidental activation, they require a key to turn lights on and off. They’re keyed alike, so all switches actuate with the same key. They also work with AC motor loads up to 80% of the current rating. All fit standard wall plates (not included).