It's not worth buying. The main reason is that you can't see anything when the hallway is dark. In order to see who is at the door, you have to constantly have a light on outside the door! It has no comparison to other products of this kind, with which you can see even in almost complete darkness.

The resolution is very good, it's just that the tube that goes through the door was short, so we had to come up with a solution to make it fit. This might be an issue for armored doors, but it's likely not a problem for doors in cottages that are less bulky.