A radar detector is an electronic device used by drivers to detect the presence of police radar guns or other speed detection devices. It works by picking up the radio waves emitted by these devices and alerting the driver to their presence. Radar detectors are commonly used by drivers who want to avoid getting speeding tickets and are legal in many jurisdictions. They come in various types, including corded, cordless, and remote-mount detectors. Some radar detectors also have additional features, such as GPS technology that can alert drivers to known speed traps or red light cameras. It is important to note that while radar detectors can be helpful in avoiding speed detection devices, they should not be relied upon as a foolproof method of avoiding speeding tickets.