KVM-301 is 4' CRT B/W Security Phone available for CCTV monitoring mode and 64 cut image memory (KVR-300). It is 4” CRT B/W Video Desplay, and connect with External 64 cut memory equipment (KVR-300). There is internal call and conversation between extended indoor units and audio and video conversation with visitor. It is available for door open and monitoring function of 5 melody selection in security sensor connection. The features include PIR sensor camera, CCTV camera connection, CCTV monitoring mode (3 Min.) and LED indications in conditions.