Yale Digital Door Viewer Memory Plus 4500 - Captures Images - Integrated doorbell - Live Viewing - Silver - 45-4500-1440-00-60-11 The Yale Digital Door Viewer Memory+ offers peace of mind through the 80dB integrated doorbell and 4" LCD screen that allows you to view and identify who's calling at your door before you open it. The optional internal memory can capture up to 50 still images of people who have called at your property whilst you are away from home, with time and date stamped still images taken on the 0.3mp built-in camera. The night vision function and weather-resistant IP56 rating ensure you always get a clear image, day or night. The Yale Digital Door Viewer Memory + is simple to install and fits doors with a thickness of between 38mm – 110mm.