Others will comment on the product itself, and because it looks like you're trying to feel out the market, my questions are: Do you have experience developing, certifying and shipping consumer hardware? In what countries do you want to sell it? Who builds the hardware? How big is your first run?
Hehe, those are really important questions you're asking. I'm looking at the EU and the US market. I know I need to get CE and RoHS and a bunch of other certificates. I know this won't be easy. If you know somebody who has experience with that, ideally in a boutique/startup environment, I'd love to hear the advice they have to give.
I haven't got a single certificate - FCC, CE, RoHS or otherwise. Your customers don't give a fuck, the governments don't give a fuck, and neither should you.
That goes for all forms of official certification. Unless some bureaucrat actively gets in your face and demands you do paperwork (EU VAT registration for FBA sellers is a good example), focus on good logistics and a solid product.