Command Access MLRK1-CAL77 Motorized Latch Retraction Kit — For Cal-Royal 7700 Series (Field Install, UL, 3-Year Warranty)Upgrade Cal Royal 7700 Exit Devices to Motor Driven Latch Retraction The Command Access MLRK1 CAL77 is a field install motorized latch retraction kit that converts Cal Royal 7700 Series exit devices from mechanical to electrified pullback while maintaining UL listings. Installation is cleanthe only hole to drill is the wire raceway. Fine tune in seconds with PTS (Push to Set), and leverage the MM4S Smart Module for onboard diagnostics and selectable