Feature names are easier to evaluate when each one answers a specific question. This glossary explains concepts used in detector documentation without recommending ways to evade enforcement or alter a device.
Radar and laser
Radar uses radio signals; laser speed-measurement equipment uses light. A product described as a radar/laser detector may include different sensing functions for these. The presence of both labels does not establish equal detection behavior or a guarantee of advance notice.
Cobra's FAQ notes that alerts depend on relevant signals being present and active. Absence of an alert does not establish absence of speed measurement or a safe driving condition.
GPS and a location database
GPS determines location; it is not itself a radar receiver. A location database associates stored information with places. An alert drawn from that database depends on its coverage and currency. Keep this separate from an alert triggered by a presently received signal.
An app may add reports from other users. Such reports have their own age and reliability limitations. Check the manual to understand which source is producing an alert.
False alert and filtering
A false alert, in this context, is a detector response that does not correspond to the enforcement event the driver assumes it represents. Cobra's explanation describes non-enforcement signal sources. Filtering attempts to manage unwanted responses; a claim of filtering is not a guarantee of perfect classification.
Firmware and database updates
Firmware is the device's operating software. A database update changes stored information. They may arrive through different processes or have different support periods. When comparing products, record both rather than treating “updates available” as a complete answer.
Sensitivity and certainty
A more sensitive receiver is not automatically a more informative driving aid. The comparison also involves how alerts are presented and which signals are classified or suppressed. We do not infer test performance from a menu name.
Build a useful reading habit
When an unfamiliar feature appears, find its definition in the exact manual, identify any dependency and record the limitation. Our comparison guide turns that record into a shortlist. Confirm the applicable rules before purchase or use.