1: 7inch color TFT video door phone 2: unlock by ID card,by password,by key,work attendance function ... 3: handfree,night vision 7" Color Video Door Phone unlock by ID card,by password,by key, work attendance function ... monitor,7 inch TFT,clear image.**intercommunication,monitoring the outdoor,unlock..**Intercommunication is available between indoor and outdoor unit.. **Brightness, ...