The 3D-PetWise can actually see the difference between humans and animals. This is a vast improvement on conventional "Pet Immune" detectors which simply reduce sensitivity in the lower zones thereby compromising detection performance and risking unwanted alarms. Features: Patented Holographic Optical Technology (HOTlens) Intruder Confirmation Circuitry (ICC). 80lbs (35kg) Animal Immunity (eg 1 x Labrador or 7 x cats). 200V/m Immunity to mobile phones 65V/m RF Immunity. 1.5 - 3.1 Adjustable Mounting Height. Surface Mount Technology (SMT). Remote Led Disable Sealed optics.