Consisting of two independent passive infrared (PIR) sensors and one microwave sensor in one common housing, Tri-Technology (TT) utilises Tri-Signal Detection Logic whereby to identify the presence of an intruder, all three sensors need to be activated sequentially in quick succession to create an alarm. The two PIRs of the XDL12TT-AM have a dedicated volumetric field of view. The top PIR detects outwards and up, while the bottom PIR detects outwards and down, without either crossing the central horizontal place between them. This setup of non-overlapping PIR sensors alongside Tri-Signal Detection Logic, delivers highly secure sequential detection and increases its tolerance to pet immunity. An advanced filter that allows the XDL12TT-AM to distinguish between the movement of trees and plants from that of an intruder. It is designed to maintain optimum performance and reduce false alarms in environments with windy weather conditions and swaying vegetation. The XDL12TT-AM boasts IP55 weatherproof rating, which means that whatever the weather, the brand-new detector is durable and reliable with protection from dust ingress, high density rain, snow and water jets from any direction. To ensure this, the rubber gasket on the lens and the foam gasket on the PIR sensor seal the detector against all weather conditions and humidity. A key weatherproof feature of the XD is its tolerance to ultraviolet light. The lenses and housing are manufactured with materials of the highest standard and are also coated with a heavy duty ultraviolet filter, ensuring that that the XD’s performance is not compromised.