Yes, it has to be Sony's. I've read elsewhere that owners have tried to use other dongles, without success. I guess that's why it's so cheap. For me, this isn't an issue. I can connect via ethernet periodically to update. As for BD live features, I don't really use them; and I can stream iPlayer through my PS3 anyway. The most important thing, for me at least, is that for £135 you get sound and picture performance that, according to the WHF team, trumps all other budget-to-midrange players available!