The Cell Phone Jammers

A certain company is selling various types of jammers for cell phone, bluetooth, GPS, etc. This is illegal correct? A quote from their site: "For homes, business, clinics, movie theaters, salon, gas station, class room..etc Comes in America or Europe model, please advise your location." Isn’t htis illegal. Can I warn authorities of the site or something?
So. If that is the case, is that anything that should be done about it?