Features: 1) Ceiling mounted 2) Metal shield with electromagnetic protection 3) Pulse count optional 4) 360° viewing angle 5) Detecting range optional 6) Auto temperature compensation, reducing false alarms 7) LED on/off optional for different alarms 8) Alarm duration adjustable Specifications: 1) Operating voltage: DC 9-16V 2) Supply current: ≤ 25mA DC 12V 3) Working temperature: -10&~50°C 4) Installation method: ceiling mounted 5) Installation height: 2.5-6m 6) Detecting angle: 360° 7) Detecting range: 6-8m (installation height of 3.6m) 8) Alarm output: normal close/normal open 9) Anti-tamper switch: normal close