DiVoom Iris-02 USB Notebook Speakers -Blue.

“The 5 Watt (2.5 Watt x 2) RMS bite, not bad for small USB-powered speakers. The volume dial for the speakers is conveniently located at the top of one of the speakers, and we found the volume and quality of the sound good whether one is watching a concert DVD of the Black Eyed Peas or rocking to 30 seconds to Mars. Of course you can also use the 3.5 mm jack to connect to your iPod or MP3 player to play the tunes stored on those devices as well.” Tech Smart

Specifications

Dimension: 69L x 85D X 65H(mm)
Driver: 2” full range driver x 2
Total RMS Power: 5 Watts RMS (2.5 watts PMSx2)
Total Peak Power: 10 Watts
Frequency Response: 120Hz-20KHz
Signal-to-noise RATIO: >70dB