X Alert on a Radar Detector: What the Signal Means

It is a warning that the detector has received a signal it classifies as X band. The label alone does not establish whether the source is police radar or another device.

Repeated alerts can occur where electronic equipment produces signals in the band, or where a relevant radar source is present. Compare the locations and consult your model’s manual before changing settings.

No. X, K and Ka are separate frequency bands. The band indicator tells you which category the detector reports, and published frequency boundaries vary by model and region.

Do not assume the source is harmless from the label alone. Stay attentive, follow traffic laws and use the detector manual and local information to understand alerts in your area.

Some detectors let users change band settings, but disabling X removes alerts for signals in that band. Check regional enforcement guidance and your device manual before making the change.