Bluetooth 4.1 lets you wirelessly connect to your smartphone, tablet, and other Bluetooth-enabled music devices to keep you entertained wherever you goSingular audio system with bass ports delivers impressive audio quality for a very enjoyable listening experienceBuilt-in speakerphone lets you answer calls without having to fumble for your phone Reliable rechargeable lithium-ion battery lasts up to 10 hours on a single charge Comes with a removable travelling bag with shoulder strap and carry handle made with REWIND fabric covering, which consists of hemp, organic cotton, and recycled plastic bottlesAuxiliary input lets you manually connect iPods, MP3 players, and other music devices without Bluetooth