The Solio Bolt battery pack and solar charger is your perfect companion, keeping you online and in-touch on the go. With an on-board battery and rotating solar panels, the Solio Bolt charges popular USB powered gadgets from your smartphone and MP3 player, to your e-reader, GPS, and camera. The design allows a pencil to be inserted into the center, which makes it acts like a sundial. Simply point it towards the sun and rotate it until the pencil no longer casts a shadow. A full day in direct sunlight completely charges the Bolt's on-board 2000mAh Li-Poly battery. When the Sun goes down, the Bolt’s battery can be re-charged via the Micro-USB port by using the included USB charging cable. From USB, the Bolt’s battery charges to full capacity in 4.5 hours. Includes micro-USB to USB cable and pencil. Weighs only 5.3oz.