Features: *MCU technology to prevent all kinds of false alarms.Anti-tamper alarm function to enhance anti-damage. *Dual PIR Sensor with anti-pet recognition technology, is under 15kg small pet immune, prevent false alarm when pet passing. *SMT chip, anti-EMI anti-RFI design. Detection distance and sensitivity are adjustable. *The PIR sensor is a wide angle 8mX8m with high catch performance and false alarm immunity. *Automatic temperature compensation, adjustable pulse count. LED ON/OFF optional, better concealment.