Mobility Lab ML300443. System type: 2.0 system, Recommended usage: notebook, Speaker placement: Portable. RMS rated power: 4 W, Frequency range: 100 - 18000 Hz, Signal-to-Noise Ratio (SNR): 80 dB. Connectivity technology: Wired, Speaker interface type: 3.5 mm. Compatible operating systems: Windows 2000/XP/Vista Mac. Audio output channels: 2.0, Power source type: USB