Goal Zero Rock Out Speaker, Green Wooden sound box and bass speakers delivers a full-range of high quality sound Protect and store your player or iPod by closing the Rock-Out and zipping it up Weather-resistant Shock cord makes is easy to hang the Rock-Out from a pack bike stem or belt Use the USB port to charge the Rock-Out's rechargeable battery; know when the Rock-Out is on or receiving a charge by way of the power indicator