1.Incorporate alarm and lock components a system, lock can be in dual directions. The head of the locking bar has a dent, when the bar with a battery symbol is ed onto the dent, the system can be locked and alarmed. If it抯 in the other direction, the system can only be locked but not alarmed. 2.Alarm system and batteries are installed directly within the lock components, causing difficulties for thieves to damage the alarm system. Hence, they will not spoil or damage the batteries and connections in the vehicles. 3.Alarm sounded when vibration is detected, overcoming the tactics used by thieves to steal away the whole vehicle. 4.Wide compatibility for various vehicles, family or garage use, etc.