Yeelight Smart Wireless Dimmer - a remote switch for your Yeelight smart lighting. Press to turn the lighting on or off, turn to adjust the brightness. Hold to then change the color of the light (if supported). Adhesive tapes for mounting on any surface, powered via CR2032 battery (lasts up to 3 years), compatible with all Yeelight lights. Warning: the battery is not included in the package.