Eton Soulra XL Solar Powered Sound System for iPod and iPhone - (NSP500B) Power: 72 square inch enhanced monocrystal solar panel, rechargeable lithium ion battery pack, charges iPod and iPhone.30-Pin Dock Connector. Protect with: Rubberized end caps and anti-glare tinted iPod chamber 8 speaker drivers (2x tweeter, 2x woofer, 4x passive radiator). 22W output with bass boost Remote control storage and removable gel-cushioned carrying strap