1. The lock and the alarming function are united into a whole. The lock pole adopts the inserting type by two steps. 2. The alarm power supply is directly fixed in the lock body, which is safe and do not cause any damage to the battery and the circuit of the vehicle. 3. When the vehicle or the lock body suffers the shake, it will automatically send out the alarming sound at once. 4. It is extensively suit to every kind of vehicles,houses and warehouses etc.