Double Beams Outdoor 30m Black Active Infrared Detector

• This is a pair of Active Infrared Detector. Install them at the opposite positions. Then there is a infrared area between these two detector parts. When someone passes the infrared region for an adjusted response time, 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 these two detector parts. Some red and green LED indicator lights are fixed. Great to be installed for security system in school, office building, hospital, home yard, etc. An English Usage Manual included in the pack. It will give you detailed instructions.