If you have the Blosckystar® Door Stopper; you don't need that product; because when you are not using it you can hold it directely to the handle of your door or window.
If you think that some can steal it, only need to put a chain inside it; like that it's compleately security.
The best is you to see the moviy in youtube of Blockystar®:
1.- It's a bumper
2.- It's a door and window stopper
3.- It's a handle and wall protector

It's more things but we let you discover them.

The door stop is the most stolen thing in any area.
You should make a locking mechanism on this ;)