Single Beam Active Infrared Detector AX-5KD 5 meters detectors AX-20KD 20 meters detectors AX-30KD 30 meters detectors AX-40KD 40 meters detectors Survey scope: Single light beam 5,20,30,40 meters Working voltage: 12V, 24V Power supply electric current: > 50MA Operating temperature: +50~ (-30) Outlook size: 49.2?6?1.6MM