Prime-Line Products U 11187R Digital Door Viewer, Black Digital 2.75 inch lcd screen, 3 mega pixel CMOS, 320 x 240 resolution Fits 1-3/8Inch to 3-1/2 inch thick doors, 9/16 inch diameter hole Uses 2 AAA batteries, good for over 700 views, included in Package 105 degrees of view Activates with push of a button on inside case