The Amzer Solar Charger is a multi-functional solar powered emergency charger. The built in 3500mAh high capacity rechargeable polymer lithium-ion battery can, of course, be charged by sunlight, as well as by computer via USB, AC adapter or car charger (all with the included charging cable). It's easy and convenient to charge all of your different mobile digital devices, from your mobile phone to your digital camera, MP3 player, GPS device or Bluetooth headset. Plug in your existing USB to device cable and charge any gadget between 3.6V and 5.5V, whenever or wherever you go. The Amzer Solar Charger is ideal for an eco-friendly re-charge or is great in any emergency situation. Note: Some devices do not charge from USB cable. Please confirm if your USB cable supports charging.