Unlike other speakers tethered to a computer via jumbled wires and power cords, this wireless active-bass 2.1 stereo speaker system can be placed anywhere within 100' of your PC or Mac. Using world-standard Bluetooth wireless technology, the integrated speaker unit (with two crisp tweeters and powerful subwoofer) allows you to enjoy your digital music collection throughout your home, porch, or office not just at your desk. A USB transmitter connects to your Computer via USB providing a wireless link to the speakers.

The receiver receives commands from the speakers' volume, play, pause, forward and rewind buttons. A built-in 3.5 mm audio/AUX jack enables direct connection of portable CD or MP3 players. An AC adapter is included, and the unit will also play for up to 20 hours on four AA batteries
Wireless Bluetooth Computer Speakers available for $ 130.
Via - Fosfor