It is more of the amusing decor postbox than one you might use beacuse you do not have a letterbox on your door.
That being said, it can be hung up using the hook on the back but there is certainly room inside to hang it more permenantly using screws to a wall or post for example.
Post goes in the flap at the top and ahe door on the front opens to remove it. Door closes using a magnet.
This cannot be secured with a lock. So perfect for the use in a closed or protected porch.
FYI: 35cm x 34.5cm x9.5cm