... Detailed Product Description Model: Bushnell Speedster II Radar Gun 101900 Introduction: A radar gun or speed detector is a small Doppler radar ... of the beam and are reflected back to the gun. The gun uses the doppler effect to calculate the speed of ... , softballs, RC cars, RC boats, etc.. -- Compact & Ergonomic Radar gun design - comfortable Bushnell point-and-shoot pistol grip -- Displays Speed ...