I think if you self-certify you have all the responsibility. (I do not know you as person or you as an organization.) But if this thing just emit in a wrong RF

I think if you self-certify you have all the responsibility. (I do not know you as person or you as an organization.) But if this thing just emit in a wrong RF band, it could mean insane fine fine from the local-frequency-band-office. And this is a very likely scenario (not like what happens if it catches fire and kill somebody...). Anyway, I heard you should aim (at least) to the US market, which needs FCC. (eg. 300+ million people with one language vs. 30+ language in Europe.)