See What A 16-Year-Old Kid Designed To Keep His Phone From Dying On Bike Rides May 21, 2015 Is it eco-friendly? Why yes. Yes it is. Thomas' invention operates like a miniature turbine. But what did he use to make it? A damn computer fan. Genius. And here are the tools he used… And the parts as well – all under five dollars. He used a supplemental battery to give the device a backup power source. And now he'll never be without his phone on his long rides. Be sure to check out Thomas’ full instructables directions on how to make it yourself!