Wireless dimmer switch features dimming control without the hassle of installation and rewiring. Contains 1 wireless dimmer switch, and 1 CR2450 battery. Up to 10 Hue bulbs can be added to the system. Simply screw a Hue light bulb into any existing medium base fixture and the dimmer will control that fixture. Back plate of dimmer switch can be mounted to a wall if desired. Dimmer switch is magnetic and can be removed from the back plate which allows it to be used as a remote control with a range of up to 40 feet. Also compatible with the Philips Hue Bridge and other Philips Hue family accessories. CSA (Canadian Standards Association) and UL (Underwriter's Laboratories) listed. 2-year warranty.