How a Radar Detector Works and What It Can Detect

It detects radio signals in supported frequency ranges that may be emitted by traffic radar. It does not identify police vehicles or prove that a speed check is taking place.

Some detectors include laser sensors, but a laser alert may occur only after the vehicle is already being measured. Laser uses light pulses rather than the radio signals used by radar.

An instant-on unit may transmit only briefly when activated. If there is no detectable signal reaching the receiver beforehand, an advance alert is not assured.

Many are designed for windshield mounting, but placement, windshield coatings, vehicle structure and the device's own instructions can affect reception. Follow the manufacturer’s mounting guidance.