the generator is connected to a motor which is connected to the battery.
when the button is pressed the motor stars spinning using very low power but with very high speed causing the turbine in generator to spin and as result produce more power(almost 400 % more) to be stored in the battery .
Over-unity strikes again! This time it's not to save the world though, it's used to charge a portable battery pack (but only when it's below 40%).
You know what, I read that, and figured: "Maybe they've confused voltage with power?"
In that case, they're using a motor+turbine as a boost-converter, which kinda-sorta would work, but it'd be ridiculously inefficient.
400% more voltage certainly isn't over unity.
Then again, I still sometimes give people too much credit..
Then again, I fail to see how this is different from any of the 10s of other solar-cell power-banks I can buy at my local "we import and re-brand chinese crap" store ?