This is an alarm two beam photoelectric infrared detector ABT-100 m. Install them in the opposite positions. Then there is an infrared range between these two detector parts. If someone passes the infrared range for a set response time, the detector sends alarm signal to the security alarm host (which is not included) Full function test self-adaptation in the environment and interference locking Patented, balanced testing of unique digital filtration Holographic spot real-time report Integrated design mounting brackets for the most convenient installation Features: This is alarm two beam photoelectric infrared detector. Integrated construction, mounting bracket, the most convenient installation Professional anti-jamming optical housing Unique shift receiving, transmission of parts with great power. Full function testing, self-adaptation in the environment and interference locking. Patented balanced control, unique digital filtering Technical data: Installation distance (max. ): outdoor: 100 m / indoor: 300 m. Colour: black. Detection mode: 2 beams locked at the same time Optical source: infrared digital pulse beam Response speed: 50 ~ 700 milliseconds Case material: PC. Package includes: 1 x active infrared detector (transmitter & receiver) Features: This is alarm two beam photoelectric infrared detector. Integrated construction, mounting bracket, the most convenient installation Professional anti-jamming optical housing Unique shift receiving, transmission of parts with great power. Full function testing, self-adaptation in the environment and interference locking. Patented balanced control, unique digital filtering Technical data: Installation distance (max. ): outdoor: 100 m / indoor: 300 m. Colour: black. Detection mode: 2 beams locked at the same time Optical source: infrared digital pulse beam Response speed: 50 ~ 700 milliseconds Case material: PC. Package includes: 1 x active infrared detector (transmitter & receiver)