This lock will siren in loud sound if it is touched or shake. Widely used in motorcycle, bike, door ect .

There are two layers in the lock, when key insert into the key hole , the key can enter the first layer , this will lock the lock, but the lock won't siren .

If you want it not only with the lock function , but also with the siren function, then let the key continue to insert to the second layer, then after 30 seconds of time, this lock can work as lock and with siren function .