Cobra Radar Detector questions.

My friend just got one used, and none of the paperwork came with it.

So, my question is can anyone tell me what the different radar codes mean? Sometimes they go off in the exact same spot, even when there’s no Cops around.

Some examples of the codes i’ve seen are: Ka1, X1, etc. What do they mean?

Different frequencies in the spectrum designated by the government. There are X, K, and Ka. Essentially they are “microwaves”.

Thanks both of you.

Just wanted to find out what a radar gun would be found under and not a garage door opener.

PA runs K band for the most part IIRC