Skullbandy Soundmine wireless speaker. Dont let this wireless speaker fool you, the Soundmine delivers solid sound. Its small enough to hold in your hand and you can forget about wires because of its Bluetooth connectivity. Power it up and hit play. Rechargeable battery lasts up to 8 hours. Play, pause, and cycle through tracks using the middle circle, + and - buttons. 3.1\ x 1.7\(7.9cm x 4.3cm).