122 Model Battery Power Automated Gate Safe Infrared Sensor/swing/sliding/garage Gate And Door Safety Infrared Photocells ,Smooth Running

1. Install each pair at opposite positions. Then there is one Infrared range between these two detector parts. If someone goes to the infrared region, the detector Will send alarm signal to the security alarm host (which is not included here). 2. Install Distance (Max.) in the above table means the maximum install distance between the two Detector parts. 3. Great to be installed for security system in school, office building, hosipital, home yard, etc. 4. Detection range can be reduced 30% in bad weather conditions, such as rain, dust, etc. 5. English Usage Manual included in the pack. It will give you detailed instructions.