Install them at the opposite positions. Then there is a infrared area between these two detector parts. Small and beautiful appearance for infrared beam detector. 1Pair Infrared Beam Detector. Relay Output: 1A 36V.
eBay
This PIR MP. It has the function of audio monitoring and positioning. Infrared sensor alarm. Adopts advanced wireless communication technology. Mini size and ultra light weight. 1 × UK Plug Power adapter.
eBay
Cannot Expand this PIR motion sensor with each other. CPVAN PIR Motion Detector Use Occasions. CPVAN detector will alarm when people passing by. EASY INSTALLATION - Just paste motion sensor alarm in the right place, you can also set it by stent.
eBay
Detection distance: 20m. Sealed design to anti-rain(fog), dust(worms) and other integrated weather, the detector sensitivity will increase automatically(AGC circuit). Single Beam Infrared Sensor with high levels of anti-RFI / EMI capability.
eBay
You can also connect an external buzzer or loud siren for outdoor use if required if used as an intruder alarm. Driveway alarm, infrared beams, yard alarm, garage alarm. High quality infra red transmitter and detector with fixing kit ideal for intruder detection or driveways.
eBay
This motion sensor alarm mainly protects your Shed, Garage, Van&etc. Cannot Expand this PIR motion sensor with each other.
eBay
Wireless PIR MP. This PIR MP. It has the function of audio monitoring and positioning. Infrared sensor alarm. Adopts advanced wireless communication technology. Mini size and ultra light weight.
eBay
Cannot Expand this PIR motion sensor with each other. CPVAN PIR Motion Detector Use Occasions. CPVAN detector will alarm when people passing by. Just paste motion sensor alarm in the right place, you can also set it by stent.
eBay