RK150DT Digital Ceiling Dual Technology (infrared And Microwave) Motion Detector uses Infrared and Microwave Channels Simultaneously, With Microprocessor for Digital Signal Processing, Temperature Compensation, Anti-electromagnetic Technology, and Special Pigmented Lenses, ensure the Detectors no Any False or Lost Alarm in Any Environment. Slim Shape makes Roiscok's Ceiling Detector Series Correspond Harmoniously with the Installation Environment. Full Orientation Top View Is 110 degree and the Max Installation Height is up to 6.0m.