This is a key box for storing keys. Originally intended for use on cars during surfing, it can be used in many places such as homes and warehouses. Opens when you align the 4 numbers. Comes with a lid to hide the numbers. The back is cushioned to protect your car. A smart key blocking bag is also included. New. (May open depending on the type of key) It's sized to fit one Tomica car, so it can store several keys. How to set the number: Lift the silver protrusions inside in the direction of the arrows. Set your desired number and return it down. This is all you need to set the number. The initial setting at the time of listing is 0000.