Fog and, more generally, poor visibility conditions (smoke, rain, snow, etc.) can render many of the perimeter security systems on the market today ineffective. SISMA CP (buried) and SISMA CA (underfloor) are, together with FUSION P2P for fences, intrusion detection systems capable of guaranteeing maximum reliability even in the most difficult environmental conditions, including thick fog.

https://youtu.be/AbbcX0n7Q4g