Vibration detector which provides a reliable perimeter protection service. The moment an intruder attempts to enter through a window, door, wall or roof through explosions, digging, impact, drilling or boring, the sensor will instantly detect this action. With a cutting-edge digital microprocessor, it can detect signal variations while keeping consumption levels low and guaranteeing ease of use and stable performance. It is equipped with 1 piezoelectric vibration sensor and 2 mechanical vibration sensors, plus 8 possible sensitivity levels which can adapt to different environments. Power supply voltage DC9-24 V, alarm output N.C., vibration detection time 2 sec, dimensions 85x25x25 mm.