The RCWPB4 is a control interface for Lectrosonics DM Series processors to provide a variety of remote control operations. The unit is connected to the 25-pin D-sub connector on the rear panel of a DM Series processor. As each button is pressed, an operation is triggered on the processor and the LED on the wallplate illuminates.

The most common use is to make changes in the setup of a DM Series processor by launching macros and recalling presets. When the button is pressed the associated LED lights up and stays lit until another button is pressed so that the LED indicates the current state of the processor. Applications such as room combining are easily accomplished with preset recalls from a single button press.