Solar Power USB External battery charger,Super fast charger,for MP3 Player,HTC , Motorola , Samsung , Nokia , Sony Ericsson, blackberry and More USB Powered Devices, favoured for the outdoor crowed Solar panels can only generate electricity,can't store electricity .If you want to store electricity, please purchase our "solar wallet" series or optional backup battery Change sunlight into electricity power, can be sucked on the car glassess,hung on any kinds of bags and set up on the floor charging for mobile phone,MP3,digital camera,video camera,GPS,etc Widely applied for outdoor hiking,riding,driving travelling,etc Sample fully charging time from solar charger YG-050?Mobile phone: 2-3hours , Mobile phone talking time(after charging 30 minutes): 20-30 minutes , PSP/GPS: 3-4hours It charges quicker under strong sunlight. Warning: can not charge or charge slowly under weak sunlight