These ultra-portable speakers offer the best in class sound quality, bar none. Don't believe us? Let your ears be the judge! Plug in your favorite mobile device and prepare to be blown away by their volume, richness and clarity. They easily outperform any speaker in their price range. Optimized for MP3 players, music enabled smart phones or any device with a 3.5mm audio output. Speakers attach magnetically to create a sleek, portable shell. Toss it in the included travel pouch and go. 4.8 watts of stereo sound provides crisp, clear treble and warm bass. Included battery pack provides power when a USB port is unavailable. Rubberized, textured finish enhances feel and durability.