Coby Portable Bluetooth Disc Speaker (White) The built-in 3.5mm audio jack, allows you to connect an MP3 player and other devices. Plus, its compact design lets you take it anywhere you go! Stereo audio jack plug and socket connects multiple XBOOM Mini Portable Capsule speakers together for maximum sound. Size defying sound - Vacuum bass design provides surprising volume and bass response in a small space-saving speaker that fits in your hand. Up to 5 hours of playtime from a single charge of the rechargeable battery. Stylish design, ultra-light weight.