This solar powered usb charger charges mp3 players or phones
Solar cell :
http://www.ebay.com/itm/2V-5V-9V-150mA-Solar-Panel-Power-Cell-for-Charger-/111128034746?pt=LH_DefaultDomain_0&var=&hash=item19dfbf3dba
Voltage booster:
http://www.ebay.com/itm/Solar-Boost-DC-DC-3V-Step-up-5-9V-max-1A-Adjustable-Module-Power-Supply-Charger-/370999242691?pt=LH_DefaultDomain_0&hash=item5661472fc3
Post time: Jun-16-2017