I bought it along with the chain lock to prevent theft.
It is shaped like a large padlock, and when it vibrates or shocks itself, a warning sound is made.
Naturally, if you are confused when opening and closing the lock, the warning sound will be heard without mercy, so it is better to open and close the lock in a dark place and maintain the key cylinder with key for hole lubricant on a regular basis so that it runs smoothly. (I use a keyhole lubricant for my front door.)
Looks like you access from European region.
Would you shop at webike.eu.com?

