Portable USB Multimedia Speakers, HP DHS-2111 The sound produced by the HP High-quality Stereo Speaker is clear and precise. They don't need an external power source because they are USB powered. with backlighting that is RGB. The sound produced by top-notch speakers is clear and precise. USB-powered; no external power source is needed. For a more natural tone and clarity, active electronic equalization balances the low, mid, and high frequencies. Setting up these USB speakers is simple. Attach the 3.5rrm to the headphone jack and the USB plug to the computer's port. ASPECTS Pose rating: 2 x 3W Response frequency: 160 Hz to 20 KHz Drive unit: 2" x 2 Connectors: USB (power), 3.5 mm jack (audio) USB power source