It will give approx 2 ETH per month. Electricity consumption will be a little only. Considering all the current mining situation, I think this device is great. I would purchase one for sure.
It's good to earn 2 eth monthly..
But that's going to shorten the life span of smartphone.
I would have called it a ponzi straightforward but as it made it's way to the MWC after creating a working device, I need some more time to study it before calling it a ponzi. Nothing in the world comes free and no business can guarantee you a fixed profit.
True, you inform us what you ever finds out.