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