Look up the FCC approval number (from the decal) on the FCC website.
Reportedly, this will tell you everything you might want to know (so
I've read). Maybe.
Obviously, it'll be one of the unlicensed frequencies like 433 MHz.

Thanks so much. I looked into the site found the frequency and even
got schematics. Start at www.fcc.gov/oet/fccid.