There is several types of protection:
- The periferal device, is to make an early detection helping by infrared barriers, underground detection systems.
- Perimetric surveillance, which applied to the envelope of a given building. It involves mechanical and electronic security measures, designed to monitor and protect vulnerable areas (doors, windows) through the use of devices such as the door contacts, surface protections, sensors vibration shocks, glass breakage, acoustic or seismic.
- The volumetric monitoring to detect any motion in a given place typically uses infrared detectors and/or multi-criteria detectors.