2-Piece USB MultiMedia Speaker Set (Silver/Black) 2-Piece MultiMedia Speaker Set General Features: Silver cabinet with Black speaker grill USB interfa Built-in amplifier Frequency Response: 60 Hz - 20 KHz Impedance: 4 W Power On/Off button Volume Control Knob Dimensions: 6.5 x 2.8 x 2.5-inches (H x W x D, approximate) Regulatory Approvals FCC CE