The Dual Technology Digital PIR Detector ED690 is a unique motion detector utilizing a single passive infrared element and Microwave technology. 
High reliablity is achieved by combining both dual tech hardware with highly sophisticated software, greatly reducing the possibility of false alarms. 

Dual-Tech Outdoor Digital PIR Detector ED690 Capacity: 
Infrared + Microwave technology (10.525GHz) 
Microcontroller signal processing 
Microwave detection based on Doppler Concept 
Microwave and PIR Dual-tech motion detector 
Gemany Heiman sensor, 
Singapore MW board 
DSP analyses technology 
Ceiling installation 
Temperature compensation, 
Reducing temperature influences 
360 degree/7m(23ft) diameter coverage when mounted at 3.2m(10.5ft)
Sensitivity adjustable, 
Alarm LED on or off optional 
No polarity power input, Anti-tamper switch