backpack with solar system to power mobile,mp3 item no:dsc00997 solar cell:0.7w monocrystalline silicone battery : 3.6v/1, 100mah ni-mh product size:43x27x11cm weight:1.5kg can be recharged by solar without electrical source ideal for reading touring,camping and leisure can recharge mobile phone fully within 3 to 5 hours suitable for mobile phoen,ipod,camera and gps ni-cd battery inside the pack whick stores electricity and provides power.