A reliable device, entirely consistent with the manufacturer. Its battery has a remarkable battery life (at least 6 hours!) It's accurate and very responsive. We can blame it to cease to display the actual speed of the vehicle when it is on "radar zone potential" ... well, it does not display the speed limit outside the "radar zones ..." But hey, it's still a very "basic" system (it does not claim to replace a large screen GPS, Garmin or Tomtom ...!) It is unrealistic to rely on this kind of gadget to foil all Radar! It is only a "help" useful to the conduct and not an "autopilot" foolproof ... When the device is well known, we know "interpret" the warning signals, and it is revealed soon indispensable!