The Rock Out 2 Solar Speaker meets the demands of the pickiest, most adventurous audiophile. With its DarkBass chamber, one-touch Bluetooth and built-in solar panel, a Rock Out 2 Solar Speaker in your backpack ensure a long-lasting musical trek. Rugged and waterproof outer shell built to withstand all Mother Nature can throw. Roomy inner fabric-lined compartment to protect gear. Attached bungee to strap it anywhere.