Three-Way and Four-Way Light Switches

Two three-way switches are used where you want to be able to turn a light off or on from two locations, such as at each end of a hallway or stair.

For illustrated 3-way switch wiring diagrams, please see How to Wire Three-Way Switches.
A three-way switch (left) has three terminal screws, may have a green grounding screw and has and no "On" or "Off" markings on the toggle.

A four-way switch (right) has four terminals, may have a green grounding screw and has no markings on the toggle. It's combined with three-way switches to control lights from three or more different locations.
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