... large peephole barrel can be done) .Fits any door 35-65mmSensor :300,000pixelsPress call button , red led ... light turn on ,door chime ring at indoor display .Press monitor button ... which turn on can last 20seconds .At the bottom of display ,left button is to adjust sound ... function ,anyone press call button ,indoor display have no door chime sound . Cancel “don’t disturb function “: ...