Just an awesome tool to have if you are the type of person to go on hikes. Put some work on that crank and charge your phone, simple as that. Imagine going on a hike, you get lost, and your phone dies? No more with this tool!
It also has a Flashlight. The battery when fully charged is 2200mAh and works on 3.7v. The generator it has outputs current of 600-800mA with 120-150r/min. When fully charged the flashlight can last up to 11h. Takes a while to charge the crank to a max (2-3h) , but you can never go wrong with a device like that! Compatible with all sorts of USB powered devices!