Technaxx Mini Musicman. System type: 1.0 system, Recommended usage: mp3 player, Amplifier: Built-in. RMS rated power: 3 W, Frequency range: 150 - 18000 Hz, Impedance: 4 Ом. Connectivity technology: Wired. Power source type: Battery, USB, Battery voltage: 5 V, Battery life (max): 5 h. Width: 50 mm, Depth: 50 mm, Height: 50 mm