Aluratek's Bump 3.5mm Portable Bluetooth Mini Speaker with a built-in Lithium-ion battery packs quite a punch for a little guy. Start streaming Pandora, iTunes or your favorites from your MP3 library without worrying about connecting any wires. Instantly pair to your Bluetooth enabled Smartphone, tablet or computer for superior high quality listening pleasure. With an output capacity of 80 decibels, the Bluetooth speaker fills even the largest rooms with superb sound quality and clarity without distortion. The Aluratek Bump features an expandable bass chamber to help add more bass to the music from your smartphone or tablet. Press down on the base of the speaker to release the extension base, and the base will pop up, creating more space for bass to resonate. Then simply connect with MP3 players, mobile phones, portable CD players, laptops and tablets, or any audio or mobile device with a 3.5mm auxiliary audio output and start "bumping" to your favorite music.