Microtools SPM-680. System type: 2.0 system, Recommended usage: notebook, Speaker placement: Tabletop/bookshelf. RMS rated power: 2.4 W, Frequency range: 50 - 20000 Hz, Signal-to-Noise Ratio (SNR): 80 dB. Connectivity technology: Wired, Speaker interface type: USB. Housing material: Plastic. DC input voltage: 5 V