The Radio Design Labs D-RCS4 is the ideal choice where sources are to be selected from a single or from multiple remote control locations, and visual indication is desired.The D-RCS4 is designed to directly interface with RDL control modules, such as the RACK-UP® series RU-SX4A Audio Selector. The D-RCS4 momentary pushbutton sends a stepping signal back to the RDL control module. When connected to the RU-SX4A, pushing the button on the D-RCS4 causes the source to advance sequentially to the next input. The audio is muted during stepping to avoid annoying bursts of audio.Radio Design Labs D-RCS4 Features:Remote Control for RDL RU-SX4A Audio SelectorRemote Source Selection PanelVisual Display of the Selected SourceMultiple Control / Indication LocationsPremium-Quality Remote PanelProfessional Aesthetic Appearance RDL D-RCS4 Remote Channel Selector, 4-Channels, Controls RU-ASX4D/R.