Wintech SPU-25. System type: 2.0 system, Recommended usage: PC, Speaker placement: Tabletop/bookshelf. RMS rated power: 2 W, Peak Music Power Output (PMPO): 350 W, Frequency range: 100 - 20000 Hz. Connectivity technology: Wired, Speaker interface type: USB, Headphone connectivity: 3.5 mm. Width: 70 mm, Depth: 74 mm, Height: 180 mm. Compatible operating systems: Windows 2000/ME/XP/Vista/7