... 3: handfree,night vision 7" Color Video Door Phone unlock by ID card,by password,by key, work attendance ... monitor,7 inch TFT,clear image.**intercommunication,monitoring the outdoor,unlock..**Intercommunication is available between indoor and outdoor unit.. **Brightness ... monitors.(different choice)**four wires,DIY installation**Including in one kit:One indoor monitor, one outdoor camera, power adapter, ...