Acme United NI-51. System type: 2.0 system, Recommended usage: universal, Speaker placement: Floor, Portable, Tabletop/bookshelf. RMS rated power: 1 W, Frequency range: 150 - 20000 Hz, Signal-to-Noise Ratio (SNR): 60 dB. Connectivity technology: Wired, Speaker interface type: 3.5 mm. Housing material: Plastic