I'm fairly certain MuteButton was already on sale and available in Ireland last year, with plans to bring it to UK (that part never came to fruition) and maybe other parts of EU.
They were supposed to publish their clinical trial results last year, but I don't think they ever did.
Then the sale was stopped in Ireland.
Last year, NeuroMod (responsible for MuteButton) raised €5.5M, which they announced in September, if my memory serves.
And now another clinical trial occurring. It seems they also plan to do US trial.
http://neuromoddevices.com/newsroom
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