Designed for use with the RGBW RF Receiver 8A 4CH, this wireless LED controller fits in standard wall switch boxes and provides on/off control as well as variable levels of dimmability. Double-clicking the knob switches between dimmer and RGB control. Adjust color and brightness for one zone. Press and hold knob to alternate between 3 different shades of white (warm, neutral, cold). No flickering, no signal wiring, no input wiring. The dimmer knob transmits an RF signal to the wireless receiver from up to 65 feet away in open air. The wireless dimmer includes a required 3V CR2032 battery installed.