Loud enough to fill the room, small enough to fit in your pocket. Compatible with iPad, iPod, iPhone, MP3, MP4, Laptop, PC, and other audio devices. Plugs into any 1/8 " (3.5mm) headphone jack. Patented Bass Chamber collapses for easy carrying and expands to boost your music's bass. Patented Daisy Chain feature allows you to link multiple NOVA speakers, and take your sound to the next level. Lithium Ion battery recharges over USB. 8 hour playback time on one full charge. 1 year warranty.