Wireless Intelligent Direction Recognition Curtain Style Detector with Built-in Big Capacity Battery Adopts self-designed MASK chip with DMT technology Adopts curtain FRESNEL lens with intrusion direction recognition function Embedded or ceiling mountable, detection angle is adjustable.(Pan rotation range 0- 20°) High sensitivity dual PIR +artificial intelligence Digital Auto temperature compensation and energy analysis Excellent interference protection with advanced digital filter circuit Excellent EMI-/RFI-protection with multiple shielding technology Reliable performance with tamper supervised, low- voltage check and status report function High sensitivity, accurate detection, fine workmanship, low false alarm Low power consumption, built-in big capacity battery, special low-power mode, ultra-long working hours