The Solio Rocsta™ Hybrid Solar Charger is a Flashpacker’s Best Friend.
Compatible with almost all major gadgets and every USB connected device. Tough and rugged shell with a built-in carabiner that can be attached to your backpack or belt look to charge all day while trekking. Doubles as an extra source of power (battery) even without the need for the sun. Just in case your travels take you where the sun can’t reach, the Solio chargers can keep a charge for up to a year. And while resting at the hostel, it can also be charged with an optional wall charger.
if you do could you pls tell me how eficiant it is and all the good things and bad things about it