This solar charger allows you to charge your phone wherever you are. No power is required. This device converts light into battery power for your mobile phone or MP3 player. This product is compatible with the following devices: iPod, iPhone, Nokia, Blackberry, Samsung, Sony Ericsson, Motorola & Sagem . The product will take between 6-8 hours to charge through solar energy or alternatively 2-3 hours by plugging in to your computers USB socket.