Understanding Three. Three-way wall switches are most commonly used to control a light fixture from two locations, such as from both ends of a hallway or stairway. www.thespruce.com
WS4777 Wall Switch Module 3. What is the WS4777 Wall Switch? The WS4777 is a prepacked 3-way operable switch. The package comes with both a master switch and a secondary switch that fit within your homes existing toggle style switch plate covers. This switch is simple to install and www.x10.com
