With its DarkBass™ chamber, one-touch Bluetooth pairing and powerful solar panel, the Rock Out 2 is ready to hit the road. Waterproof outer shell withstands Mother Nature, while the attached bungee lets you strap it to almost anything. Monocrystaline solar panel keeps it charged. When the sun sets, an 800mAh lithium battery continues amplifying your tunes for more than 10 hours on a single charge. 7″ x 3.75″ x 2.5″. 1lb.