Red4Power R4-B001UB. System type: 2.0 system, Recommended usage: PC, Speaker placement: Tabletop/bookshelf. RMS rated power: 4 W, Frequency range: 80 - 18000 Hz, Impedance: 8 Ом. Connectivity technology: Wired, Speaker interface type: USB/3.5mm. Width: 85 mm, Depth: 210 mm, Height: 70 mm. DC input voltage: 5 V