The AI-JP-4MED is a video master station with a 7" color touchscreen LCD. The JP-4MED offers handset (duplex) and hands-free (VOX) communication. This unit will support up to 4 door stations and 7 sub masters. All inside stations are equipped with a door release button for the user to allow visitor entry. The JP-4MED is also equipped with PTZ and brightness controls, giving the user control of the door station camera angle and camera lighting for better visibility. Picture memory records up to 20 calls to internal memory and 1,000 calls to a removable SD / SDHC card (not included). The JP-4MED connects to door stations using 18AWG, 2 conductor cable and connects to sub master stations using CAT5e or CAT-6 cable.