A radar gun is a device used to measure the speed of moving objects, commonly employed by law enforcement to monitor vehicle speeds. It operates by emitting radio waves that bounce off the target and return to the device. The time it takes for the waves to return allows the radar gun to calculate the speed of the object. Radar guns can be handheld or mounted on vehicles and are often used in traffic enforcement to ensure compliance with speed limits. They are also utilized in sports, such as baseball, to measure the speed of pitches.