AtlasIED BBWP-S4K1B BlueBridge 4-Button / 1-Level Controller | Color: BlackThe BBWP S4K1B is part of the BlueBridge DSP product line. The BBWP S4K1B is a four button wall controller that can be used to change any four preset selections and level control. It can also control button, preset, matrix connect, and mute functions. Using BlueBridge Designer software, you can virtually assign level values and stack multiple actions to the single level control.