Hercules Speakers XPS 2.1 40. Peak Music Power Output (PMPO): 80 W. Headphone connectivity: 3.5 mm. Minimum system requirements: PC: Windows 98 SE, Me, 2000, XP. Type: In-wall/On-wall/In-ceiling speakers, Audio output channels: 2.1, Subwoofer RMS power: 20 W