Microlab MD 112. System type: 1.0, Recommended usage: mp3 player, Form factor: tabletop. RMS rated power: 1 W, Frequency range: 30 - 20000 Hz, Impedance: 4 Ом. Connectivity technology: Wired, Interface: USB/3.5 mm. Power source type: Battery, USB. Width: 86.5 mm, Depth: 86.5 mm, Height: 48 mm