The Elvox Model 620R is a Petrarca Style apartment handset for use with the 5 Wire AC Buzzer Ring Audio entry systems. The 620R can be used stand alone as an audio only station or combined with a 6000 using a 6145 wall plate or 6142 desk kit for a complete audio video station. The 620R provides full duplex conversation with the calling entry panel, concierge call/door release control and signal to activate the 6000 monitor when both are mounted together for audio-video operation. Optional restricted lock feature allows only the station in conversation with the door to release the lock.