View live images of who is at the door. Date/time stamp allows you to see when visitors called. Built in LED for assisted night viewing. Images stored (on optional SD card) so you can see who called even when you were out. Digital images can be easily manipulated via the main unit, allowing you to zoom in and out to see clearer and in more detail. 2.4" clear viewing screen provides images up to 10 times bigger than traditional spy holes. Simple installation, fits almost any door (24 -72mm). Viewer screen can be seen from several metres away from below or at an angle which is ideal for children. Robust, weather resistant metal construction. Includes long-life, rechargeable battery. (battery charger included). Wide 90+ Deg viewing angle while not suffering from image distortion found on traditional door viewers. Includes Door chime (80db at 40cm).