XBOOM Mini Portable Capsule Speaker with Rechargeable Battery and Enhanced Bass+ Resonator - Yellow Enhanced Bass+ Expansion System (BES) enables Full-bodied, 360-degree superb sound - 40mm Driver 3-Watt Output. Ultra-portable compact size with long-lasting embedded rechargeable battery provides 12+ hours of continuous playback from one single charge. Free splash-proof carrying travel pouch for easy storage and enhanced portability. Modular "Buddy-Plug" Design: Integrated stow away 3.5mm stereo audio jack plug and socket connects multiple XBOOM Mini Portable Capsule speakers together for maximum sound. Universal Compatibility: All iPods, iPhones, iPads, Samsung Galaxy phones, Android phones, Blackberry phones, MP3 players, CD players, Tablets, PC and laptops, and More. Rated Best MP3 Mini Portable Capsule Speaker of the Year.