This is Active Infrared Detector.Install each pair at the opposite positions.Then there is a infrared area between these two detector parts. When someone passes the infrared region, the detector
will send alarm signal to the security alarm host (which not included here).
Install Distance(Max.)in the above chart means the maximum install distance between the two detector parts.
Great to be installed for security system in school, office building, hosipital, home yard, etc.
Detecting range can be reduced to 30% in bad weather conditions, like rain, dust, etc.
English Usage Manual included in the pack. It will give you detailed instructions.
Product Name: Active Infrared Detector
Type: Single Beam
Install Distance(Max.): <20m (Range will be reduced to 30% in bad weather condition:fog,rain,dust
Infra-red Frequency: 1.92Khz
Power Supply: DC/AC 12 to 24V
Wave Length: 940nm
Input: RX 15mA~TX 30mA
Operating Temperature: -20C to 70C
Relay Output: 1A 30V max.
Sensor Angle: <+-10
Size (Each One): 49.2*76*21.6mm
Housing Material: Plastic
Shape (Each One): Half Egg Shaped
Net Weight: 20g
2 Pair x Active Infrared Detector
2 x English Usage Manual