◎ Adopts vibration,  touch, movable omnidirectional detection principle.
◎ The vibration sensibility in 3 levels, High, medium, low, sensibility variable upon necessity to efficiently avoid error alarm.
◎ High compatibility,can be compatible with a variety of host.
◎ With low battery voltage indication.
◎ Commonly used to doors and windows, safe, coffers, vault door, ATM, Night libraries and safes, walls, roofs and so on.