Vandal resistant 4000 Series amplifier module with 1 buttons for use on the VX2200 system. Includes Speak, bust and open LED's and can be expanded up to 23 call buttons. Built in lock relay (Dry contact), push to exit input and signals to control video and link to other entrance panels. Facia is 12 gauge stainless steel. Includes 2 characters engraving per button.