product features：
Mechanical code lock features: pure mechanical code lock, no electrical wiring, no battery, simple installation. The square spring lock can firmly lock the door. A reverse push door hook is installed to prevent the spring lock from being pushed back. The mechanical device with excellent durability has passed more than 400000 comprehensive action tests.
12 buttons can be used to combine memory numbers, and more than 4000 memory numbers can be selected.
Can code at will: any memory number can be entered in any order.
Slippage device: it can disable the attack and destruction from outside.
The specially processed stainless steel button will not leave any traces of use.
Emergency type: no matter whether it is locked or not, you can go out freely from the room without entering the memory number.
