The Everlite Solar Headlamp comes with a 2.5 x 4.5-inch solar panel that quickly charges the small lithium ion battery; six hours in the sun = 12 hours on high and up to 24 hours on low or flash modes. The solar charger also hooks up to cell phones, GPS, iPods and other electronics using Everlite’s converter cables. At only 5 ounces for the headlamp and panel, the Everlite Solar Headlamp is the perfect option for extended trips and camping adventures.