Technaxx MusicMan MA. System type: 2.0 system, Recommended usage: notebook, Amplifier: Built-in. RMS rated power: 6 W, Frequency range: 150 - 18000 Hz, Impedance: 4 Ом. Connectivity technology: Wired. Power source type: AC, Battery, USB, Battery type: 600 mAh, Battery voltage: 5 V. Width: 50 mm, Depth: 165 mm, Height: 52 mm