X10 is a communications "language" that allows compatible products to talk to each other using the existing electrical wiring in the home. Most X10 compatible products are very affordable and the fact that they talk over existing wires in your home means that no costly rewiring is necessary. Installation is simple, a transmitter plugs (or wires) in at one location in the home and sends its control signal (on, off, dim, bright, etc.) to a receiver which plugs (or wires) into another location in the home.

Transmitter   Transmitter
110V Wires
 

X10 is Simple Press a Button on the Transmitter and the Signal is Sent over the Home's Wiring to a Receiver

Using simple dials or buttons you assign each product with one of up to 256 addresses. If you wish two products to go on and off together you can set them to the same address or use scene addresses on many advanced products. All X10 compatible products can be freely mixed and matched.