Pair Of Photoelectric Beams - Indoor: 750M Outdoor:250M -Active Infrared Detector Ab250 The Abe-250 Is A Set Of Photoelectric Sensors Using Three Beams Of Up To 750 Meters Indoors (250M Outdoors) For Detecting Motion Within Its Range. When The Three Beams Are Blocked At The Same Time , The Alarm Triggers. Specifications: Sleeve Type: Digital Infrared Pulse Number Of Beams: 3 Beams Type Of Detection: Simultaneous Interruption Distribution: Interior Of 750M, 250M Outdoor Output: Nc Contact Capacitor Co Ac, 30V Dc 0.5Ma Response Time: 50 To 700 M Sec Power: Dc13.8 - 24V, 18V-Ac11 Tamper Output: Normally Closed What's in the box Pair of Beams