The Eton Rugged can be wirelessly connect to any Bluetooth enabled device. The speaker charges your smartphone via USB so the tunes never stop. The Solar Panel powers the rukus indefinitely when you're in the sun. The speaker also comes with a micro-USB cable to charge internal lithium ion battery. Best of all, the battery lasts 8 hours after you're out of the sun or indefinitely if you keep the Rugged rukus in the sun.