Acme United NI-30. System type: 2.0 system, Recommended usage: PC, Speaker placement: Tabletop/bookshelf. RMS rated power: 6.5 W, Frequency range: 150 - 20000 Hz, Signal-to-Noise Ratio (SNR): 55 dB. Connectivity technology: Wired, Speaker interface type: 3.5 mm. AC input voltage: 220 - 240 V, AC input frequency: 50 - 60 Hz. Cables included: AC