Multimedia Speakers - 20 Watt Offspring Technologies SPK1 2-piece MultiMedia Speakers General Features: Silver profile 2-piece speaker RMS: 1 Watt x 2 P.M.PO: 350 Watts Drive unit: 2 x 3-inch oval type Impedance: 4 ohm S/N: 50 dB 20 Watt built-in amplifier Power button Volume control knob Headphone in jack Regulatory Approvals: UL