What a super little camera! (now only $96.82. Oscar@Jimbu Security) you can't go wrong with this great little camera! 10 days from order to delivery using free epacket. This cam could be mounted on the inside of a door by cutting a small pocket (approx.2"x3"x1" deep) in the door. The thickness is almost the same as the door. so from the outside it would look almost identical as a peephole viewer. Since it's so small I went with the simple exterior mount with a through hole for the cable.