Optex SL-650QN Quad beams active infrared (AIR) sensor
                        
                        
                     
                    
                        Key Specifications
                        
                            
                            * High power Quad beams with high grade aspherical lenses 
* 200m detection range 
* Easy-to-see vivid interior colour for optical alignment 
* Sniper Viewfinder, a telescope lens magnifying twice to help the optical alignment 
* IP65 water protection rating 
* Anti-frost hood design 
* Can be stacked in beam towers