Yale DDV1 Digital Door Viewer with Internal MemoryYale DDV1 is a digital door viewer with internal memory, an innovation in door viewer security.Automatic saving of image into internal memoryImage with time and date stampDoor bell integrated on the outsideVery clear image on screenEasy operation – just press the buttonCan replace mechanical door viewer without additional workInfrared camera with night mode functionSpecifications:Fits standard 14mm hole from mechanical door viewerDoor thickness 38-110mm3.2″ LCD screen4 pcs. AAA batteriesViewing angle 105 degreeBuilt in internal memory stores up to 50 imagesAllows for a micro SD card to be inserted to enhance memory