Great snarky reply, but you *do* realize the Amazon product page for the Roku Express currently says it supports Dual-Band, and I bought it specifically for that feature? I'm not an idiot, I checked before buying.
Even worse, now Amazon's wanting to charge me $8 to send it back, even though their product page had the wrong information. So I'm out $8 because of this. Thanks, Roku.
And for the record, no, this information does not appear anywhere on the box or the manual. Why would it? That might be actually useful.
EDIT: and now of course that I'm trying to verify this, the Q&A answer that said it supported dual-band is gone. Goddamnedit.
Ok I was not crazy, here it is: https://www.amazon.com/ask/questions/Tx13TPRF2SUJ0I9/ref=ask_sa_saa_al_hza
The answer from rickr1953 (now at the bottom because I voted it wrong) clearly said the product supports dual-band. Now I'm out money because he's a liar. Great.