This is the ABT- 100m photoelectric dual-beam infrared detector. Install them in opposite positions. Then there is an infrared area between these two detector parts. If someone passes the infrared area within the response time, the detector will send an alarm signal to the security alarm host which is not included here . Full function control, self-adaptation to the environment and troubleshooting Patented, balanced verification of unique digital filtering Holographic spot real-time report Integrated design installation brackets the most convenient installation.