What the K label means
K band is part of the microwave spectrum used by some speed-measurement systems. The detector reports a signal category, not its source.
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Guide
What Is a K Alert on a Radar Detector and Why Does It Sound?
A K alert means the detector classified a signal in that band. It can have several sources, so do not treat it as proof of police radar.
Why other vehicles can trigger K alerts
Some driver-assistance equipment emits signals that may cause alerts. Automatic doors and other sources can also contribute, depending on the detector and surroundings.
How to assess an alert
Notice whether it repeats at a location or changes with nearby traffic. Context cannot reliably confirm enforcement, so keep obeying posted limits.
Which settings may reduce nuisance alerts?
Some makers offer band filters, city modes or vehicle-interference settings. Read the manual because filtering may affect which signals are detected.
When an alert sounds
Keep attention on driving. Do not adjust settings while moving; pull over safely and consult the manual if the pattern is unfamiliar.
Common questions
Questions before you buy
Does a K alert always mean police radar?
No. A K-band signal may come from several sources, including vehicle systems.
What frequency is K band?
The range depends on the detector’s configuration. Consult its manual for the frequencies it scans.
Can I turn K band off to stop false alerts?
Some models allow band changes, but disabling a band may remove relevant alerts. Review the manual first.
Why does K alert appear near another car?
A nearby vehicle’s driver-assistance system may contribute to interference; model filters can help but results vary.
Sources and how we chose
- Uniden R3 official specifications · 2026-10-15
- Cobra RAD 700i support · 2026-10-15
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