Coby CSBT-302-GRN Portable Bluetooth Disc Speaker (Green) Plays music up to 30 feet from any Bluetooth-enabled device such as your smartphone, notebook, tablet, etc. Up to 8 hours of wireless play on a single charge. Superb best quality room filling sound in an ultra portable mini round and rugged frame. Portable design. Love it loud: very little to no distortion at the highest volume. Keeps playing while it's being charged.