We got to know this key safe on vacation and there were already done. The safe is very robust and who basically has no fear, this entrusting a key is plugged into the adapter. The statement, which find so many key place, but you do not necessarily need to be believed! With larger keys (for example thicker car keys) you can get very quickly to the border, where the safe can no longer be closed. 1 large key and a fat car keys go just like that.