Add/Relocate 3 Way Switch ... treewell wireless light switch and receiver kits; allowing you to activate multiple devices with one switch or control one device with multiple switches.

That's where 3-way switches come in ... What's the difference between a 3-way switch and a single-pole switch? A single-pole switch controls a light or lights from a single location.

Users have immense control over how its motion- and light ... switches on opposite sides of a room, for example—then you’ll need to replace it with a multi-pole (aka 3-way) smart switch.