Bump 3.5mm Portable Mini Speaker Connect Smartphones, MP3 players, Tablets an iPod or any MP3 Player with a 3.5mm headphone connector. Up to 4 hours playback using internal Lithium-ion battery. Adjustable sound direction - speaker top swivels 180 degrees. 3.5 mm cable securely wraps around unit and holds in place. Limited 1 Year Warranty.