Instruction: Answer the given question using the supporting document.

Input:
Question: Does anyone know the range at which the radar starts to detect signals?
Document: Mine goes off crazy when I don't even see ANY police cars or radars within range, then when police cars DO pass it doesn't even beep once. I know it's not a police cars detector, but at least it shouldn't give off so many false signals.The light indicators are so dim sometimes that you can't even see it.
It is very sensitive,So it really detects all bunch of signals that doesn't always belong to a COPS car. On the other hand if the COPs car doesn't have its radar on  then The cobra detector ofcourse won't detect it.Bottom line Use common sense and Drive carefully .
So far so good. No problems and it's reliable. The unit is light, which makes it a lot more tranport friendly (easier to carry in your briefcase, bag, pack, etc. instead of leaving it in the car for a potential smash and grab robbery).However, it's not as sensitive as my Escort 8500 (the range is not a great as the Escort) and not as resistent to certain other radar detectors that put out jamming signals to fool radar guns.
Depending on the geography of your location, this detector can usually detect about .5 mile away. It does not go around curves, obviously, and only will pick up when you are in a direct line with the radar emitter. Sometimes, it will detect 2 miles away on very straight roads.The only annoying thing is that it picks up home radio/scanner signals too, but you'll get that with any detector.
I purchased this unit last week (not from Amazon). Overall, it's very easy to set-up and operate. It did detect most radar/laser signals (plus some false ones - easily corrected with the one button touch switch to city mode). Also, I didn't have a problem with seeing the unit's display even in direct sunlight on my dash, unlike some other reviewers. The audio alerts are also loud enough and the loudness can be adjusted with the on/volume button.
awesome radar detector, it has a digital voice to tell you the band of radar and the tone/ visual representation of range is awesome.
its work fine some time niosey because it's work and i don't see any thing in the road,and it warn @ near range from the radar sight or camera.
it has incredable range but it could be just me but the velcro came off yesterday but thats just velcro but like other comments its a radar detector not a cop car detector
The radar and radio signals are different beeps, though, and you can easily tell the difference.
Radar perform as described. Only problem it detect signal on a short way. Not much time to react. Basically I can see the cop car 1st than the radar. It won't tell how far to close is the signal.
Answer: after 2 weeks of use, its range is between 1/2 and 1 mile....  works good.