From the Manufacturer
The Skylink WS-100/WS-100N Wireless Remote Control: turn lamps on before entering the house or control outdoor Christmas lighting from inside the house. Perfect for any plug-in lamp, stereo or other small appliances. Activate any electrical appliance that meets the product's rating. This model is for Channel A. Also available in Channel B version.
This wireless remote system allows you to control indoor or outdoor lights and electronics from up to 100 feet away. Quick and easy to install, the receiver plugs into any standard 3-prong grounded outlet without extra wiring. The remote transmits through walls so you can turn lamps on before entering the house, or control outdoor lighting from inside. Compatible with any plug-in device, including Christmas lighting, lamps and electrical appliances that meet the receiver's rating. The Skylink Model WS-100 is available in "Channel A" or "Channel B ". If you plan to operate one device, purchase Channel A or Channel B; If you plan to operate two different devices separately, purchase one channel A and one channel B. If you plan to operate many different devices, purchase Skylink HomeControl model #TC-318-14 and accessories by searching within the Amazon website.