Great Value Video and Audio basic video door bell intercom system. Use your existing 4-Wire cable to connect this system Dahua 4-Wire indoor monitor KIT, 7-inch Screen Unlock, video call, volume adjustment, and doorway monitoring 7" TFT screen Video intercom function: Unlock ...Great Value Video and Audio basic video door bell intercom system. Use your existing 4-Wire cable to connect this system Dahua 4-Wire indoor monitor KIT, 7-inch Screen Unlock, video call, volume adjustment, and doorway monitoring 7" TFT screen Video intercom function: Unlock, voice call, video call, volume adjustment System Capacity: 2 door stations + 3 indoor monitors Multiple bell sounds Supports digital wide dynamic range (DWDR) Australian stock, all components are for AU market including Power Supply VTH1020J Monitor & VTO1000J OUtdoor Station