Box set includes JF-DA, JF-2MED, and PS-1820ULMarketing Information: Hands-Free Video Intercom Set (JF-DA, JF-2MED, PS-1820UL)Wiring Type: 2-wireMaximum Wiring Distance: 300 ft (91440 mm)Display Screen Type: LCDImage Sensor Type: CCDInput Voltage: 18 V...