The JP-DA is a surface mount door station used with the JP hands-free, color video entry series. The unit mounts to a 1-gang box and is made from sturdy ABS plastic with a clear polycarbonate lens cover. The JP-DA features a color 1/4" CMOS camera, speaker and mic for communication, illuminated call button and white illumination LED for low light conditions.The 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 PS-242UL is a DC 24V Class II power supply used for Aiphone intercom applications. This power supply is UL and CSA listed and is designed for indoor use only.