Enjoy music wirelessly from your smartphone or tablet. 20 watt system with EQ bass boost and quad speaker system for massive sound. Up to 17 hours of playtime from the powerful 4000mAh built-in rechargeable battery. Built-in mic for hands-free calling. Control tracks and volume directly from the speaker. Aux input to enjoy music from mp3 players and other wired sources. EQ bass boost cranks out dynamic sound.