Pyronix PIR Grade-3 Detector with dual technology element is based on Pyronix tried and tested patented technologies, the TMD15 offers outstanding detection performance with optimum reliability designed to meet the latest industry regulations. Depending on the environmental conditions, the detector will automatically adjust its sensitivity. The Independent Floating Thresholds (IFT) technology is patented by Pyronix, allows the detector to respond to environmental changes by automatically adjusting its levels of immunity to background disturbances. Quad LED indication provides indication of all technologies and detectors. 15m volumetric coverage in both PIR lenses. Ideal for hostile environments. Ideal in high security environments where there may be a significant risk of masking. An area immediately in front of the TMD15 is monitored continuously and separately from its normal mode. Any intrusion into this area activates the anti-masking process. It also has separate mask and trouble output reporting, anti-blocking technology provides blocking detection up to 15m in disarmed mode, for example, if the field of view is blocked when the system is being armed, arming will not be possible until the blockage has been removed. Triple coverage ensures that an alarm will not occur unless all three detector fields are activated in a particular sequence. Offers unparalleled stability in the elimination of false alarm activations.