Designed for use with the RF Receiver 8A 4CH, this dimmer switch fits in standard wall switch boxes and provides on/off control as well as fixed levels of dimmability. 0.1-100% full range dimming via dial wall control let you have full control over your single color LED lighting system. No signal wiring nor input wiring. The dimmer knob transmits an RF signal to the wireless receiver from up to 50' away in open air. The wall-mounted wireless dimmer includes a required 3V CR2032 battery installed.