Leviton SGVSM-W Decora Strauss Transformer-Free Impedance Matched Volume Control, White Decora slide control with precision 12-positon switch (including full OFF position) Adjustable impedance settings enable configuring systems from two-to-six controls The Impedance Matching Volume Control provides for multi-room distribution without the necessity of using external impedance matching devices Detachable cable connector is compatible with all standard speaker wire sizes Provides the ability to adjust the volume of a pair of stereo speakers within a single listening zone