Lutron Spacer System 120 Volt Five Scene Wall-Mounted Master Control with Two Infrared Blasters is simple and easy to use. The tabs have five preprinted dimming scenes which include bright entertain dine casual and night. There is also an off tab and all dimmer scenes can be overridden manually. Spacer Master Control features front accessible service switch to disconnect load power includes radio frequency interference suppression circuitry has UV stable color line frequency compensation and surge protection and heavy duty components for a long product life. Remote mounted spacer dimmers can talk to the master control using IR blasters attached to inside of dimmer. (Includes two).