The Braven 570 Portable Wireless Speaker (Green paint finish with Black end caps) features 2x custom HD audio drivers which provide stereo audio amplified by left and right channel passive sub woofers. A 6w total output speaker (3w per channel) will enable your media to fill the room with engaging audio. Can be used wirelessly with any bluetooth device from up to 33 feet away, also connect using the included 3.5mm audio cable. The Braven 570 uses a 1200 mAh portable USB power bank to keep your music, audio, and calls going for up to 10 hours. Plus, when you're out and about, you can use it to charge your USB mobile device. High fidelity audio drivers deliver rich room-filling sound to your calls, music, games, and media. It's a powerful speaker in a beautiful portable package. The built-in speakerphone makes it easy to take and make calls hands free or in a group. Easily switch between playing audio and making or receiving calls.The internal mic is compatible with Bluetooth enabled phones, Facetime, iChat, Skype and other applications (not all phones will support these features).