Three new outdoor infrared detectors are joining the ADPRO range of external or passive PIRs from Xtralis of Hemel Hempstead, United Kingdom. The new detectors offer a detection pattern as large as 50 meters by 30 meters. The PRO Series are sensitive, passive infrared detectors designed for outdoor protection. They detect humans by sensing temperature differences between them and the background. Antitamper features generate an alarm if a detector is displaced from its position. Detectors can be used as standalone units or in multidetector environments. They have both AD and DC supply capability and intuitive scene-learning capability to reduce false alarms caused by moving vegetation, small animals, and environmental changes. All are contained in weatherproof housings and protected against dust and moisture.