Put the into the shells, then turn the screw to adjust the fixed distance according to your door thickness, and the doorbell mount will be installed.
This AntiTheft mount suitable for 1, 2, 3, 3Plus, 4.
mount has a full-coverage designs and a creatively invisible fixing methods, which can AntiTheft and No Drilling.
Easy to disassemble, just open the door and turn the screw to remove the doorbell mount from your door, this will not cause any damage to your door.
Applicable to the door opened from left right, but the door must be swing inwards.