Jenix Photoelectric infrared beam sensor with digital frequency conversion, Mount transmitter and receiver, build an invisible fence which people can't see. When someone passes the infrared or beam is blocked, the detector will send alarm signal to the security alarm host (which not included here) i.e motion is detected. Once installed, anyone who passes the detection lines would trigger the alarm panel, which sends alarm notification to your mobile phone or warns you by calls or text message with the use of Jenix Security Alarm panel ( not included). Sleek design with polished PC enclosure with dew & frost resistance to ensure that it still work under foggy weather conditions. With a maximum of 100m as outdoor detection distance, or 300m for indoor use, it's an alarm extension for many projects.