1-Gang V-Pro Smart Supplementary Controller (Enabling Multi-Way Dimming with a V-Pro Smart Master for up to 3 positions)- Traditional rotary dimming with Multi-Way operation when used with supplementary controllers- V-Pro Smart Control for intuitive dimming- Simplified programming system for easy setup- Full dimming control from up to 3 dimmer locations- This unit will only work when used with V-Pro Smart master dimmers for multi-way circuits