7 inch color ful video monitor, with a 800 × 480 display.4 Four-Wire Interfaces (1-ch Video Input, 1-ch Audio Input/Output, 1-ch Power Supply, 1-ch Grounding in 1 Four-Wire Interface). The white color and design fits well with your wall and the design of the wall. It has very clear audio and clear images. More than one camera can be connected to the main indoor monitor. Analogue cameras can be connected to provided in puts. The Indoor Unit can be used to open third party locks in access control.