Posted on October 18, 2010.
External security sensors that are used fora Well ...
Outdoor security sensors detect intruders as they enter a protected area and before they have access to persons or property value.
In a correctional environment, safety sensors can be used to immediately detect attempts to escape from prison. A security system for external quality shows a significant return on investment by reducing the risk of theft, damage or injury.
external sensors can be used either to complement indoor security sensors or primary safety in situations where internal security is not feasible. Able to protect assets both inhabited and inhabited sites, outdoor security sensors are a practical solution for remote sites where guards are not a viable alternative ....
this is taken from:
http://mydailysecurity.com/Outdoor-Perim ...
Enjoy:)