Keyteck SP-Q2.0BO. System type: 2.0 system, Recommended usage: PC, Speaker placement: Portable, Tabletop/bookshelf. RMS rated power: 8 W, Frequency range: 140 - 20000 Hz, Impedance: 4 Ом. Connectivity technology: Wired, Speaker interface type: USB. Weight: 500 g. Compatible operating systems: Windows 7/Vista/XP