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Integrated design, installation brackets, the most convenient installation. Holographic spot real-time report. Unique displacing receiving, transmitting parts with big power. Full function checking, self-adaption in environment and trouble locking. Patented balanced checking, unique digital filteringInfrared Detector :ABT-100;2 Beams Install Distance(Max.) : Outdoor: 100m / Indoor: 300m Detection Mode : 2 Beams Blocked SimultaneousOptical Source : Infrared Digital Pulse Beam;Response Speed : 50 ~ 700msec Operation Temperature & humidity : -25 ÃÂ°C – 55 ÃÂ°C 5% – 95% RH (Relative Humidity) This is Alarm Two Beam Photoelectric Infrared Detector ABT- 100m. Install them at the opposite positions. Then there is a infrared area between these two detector parts. When someone passes the infrared region for an adjusted response time, the detector will send alarm signal to the security alarm host (which not included here) work with 2pcs power apater