The ARC-EX4 Modular Remote Control Wall Panel from Symetrix is the expanded version of the ARC-SW4. Identical in form and function to the ARC-SW4, it expands the capabilities of a Modular ARC Wall Panel. The ARC-EX4 uses four momentary push-button switches for source selection, preset triggering and more. Each button has a corresponding tri-color LED for user feedback when connected with Symetrix DSPs.