NTT will let for sale the system in May this year first only in Japan for approximately 190 USD, and in near future in the rest of the world.
Im further from the future. Greeting from 2016. We are more advanced than you folk. Hahaha. Lol.
Greeting. I'm from the future. 2015. This is old tech made in 2004. But got popular only last year(2014). Lol.
I already made one for myself with just an lipo and solarpanel and a regulator