4 wire 3.5" door intercom two way door phone,infared door phone,waterproof phone manufactuer offer 4 wire 3.5" door intercom008 (Outdoor Station): B ... CCD Camera with night vision Outdoor station, door bell, video intercom, audio/video communication Watching door entrance, remote lock release Optional for extended ... KGS G.W.: 1.70 KGS 4 wire 3.5" door intercom