Edifier M20 USB Hub. System type: 2.0 system, Recommended usage: PC, Speaker placement: Tabletop/bookshelf. RMS rated power: 10 W, Impedance: 8 Ом, Signal-to-Noise Ratio (SNR): 85 dB. Connectivity technology: Wired, Speaker interface type: USB/3.5mm. Width: 63 mm, Depth: 156 mm, Height: 147 mm. AC input voltage: 100 - 240 V, AC input frequency: 50 - 60 Hz, DC input voltage: 5 V