Reliable quad active infrared photoelectric detectors, activate alarm only when two beams are blocked simultaneously EDC working mode, can remind user check the detectors and avoid false alarm Advanced anti-crawling design More adjusting methods, convenient alignment: Indicating LED and buzzer besides view finder and measure voltage More detecting modes Convenient installation: LED, buzzer, view finder and measure voltage Outdoor detection range: 80M/110m/160M/250M Power: 10. 5 to 28V DC Maximum current: 165mA Temperature: -20 to +60 degrees Celsius Store temperature: -30 to +60 degrees Celsius Alarm output: NC/500mA at 24V DC Tamper output: NC 1A/24V AC Alignment range: Horizontal: 180-degree Vertical: 20-degree Material of cover: Black PC Weight: 1, 300g