Solar charger is a mobile power solution for the small device around you like mobile phone, MP3/4/PDA/iPad etc. all the solar product got a solar panel on one side. And there is a rechargeable battery inside to store the energy. You just need to put the product under the sun, the solar panel will absorb the sun energy and transfer it to power and store into the battery inside, then you can take it with you when you are out of home. So it is a very easy and convenient back up power for your mobile phone and MP3/4 or iPad etc.