>Some time ago, I posted a message saying that low-power RF
>transmitters intended for use in EC countries (like France) were
>illegal for use here in the States.
>
>I've since discovered that I was wrong; the newest EC standards put
>those transmitters at 433.92 MHz, and we in the States are now
>allowed to use anything in the 290-450 MHz range.

I would check first.   433.92 MHz is in the middle of the American 70 cm
Amateur Radio band.  I'm sure these are legal in the US if you have a ham
license, but probably not otherwise.