Inertia detectors, also termed vibration or shock sensors, are designed to protect the perimeter of the property. This makes them useful in situations where the alarm can be set while the premises are occupied - e.g. babysitters.

Modern inertia detectors are microprocessor controlled and are pre-programmed to filter out common causes of false alarm causes - e.g road traffic.

Inertia detectors require 6 core cable (2 alarm, 2 tamper, 2 12v power).