7" Color Video Intercom-Door Phone with Backlit Access Control Keypad Antivandal Weatherproof, Night VisionVideo Doorphone with Back Lit Access Control Keypad 7 inch TFT wide LCD screen, slim and stylish Color Monitor. Dimensions: Outdoor station- 3 X 7 1/4 X 2 3/8 Inch; Monitor-9 5/8 X 6 1/4 X 5/8 Inch 40 programmable codes different codes with latch capability Add one more outdoor station and 3 more monitors