Use the RayCel to charge your "cell phones and cameras with the power of the sun. Simply insert any 3.7 volt removable battery into the universal charging port, place the RayCel in direct sunlight and charge. The RayCel"s 1 watt solar panel charges an 800mAh phone battery in as fast as 4 hours. The RayCel helps you keep up with the increased power demand by today"s multimedia devices.