QHM611 USB Mini Speaker. Have sleek surface - great design for notebook or desktop. Sound Quality in balanced proportion of BASS, TREBLE AND CLARITY. Connectivity: Power Jack: USB 2.0 (Plug & Play) Audio Cord Type: 3.5mm Controls: VOL-, VOL+, Mute. Specifications: Output Power-2Wx2 (RMS) S/N Ratio-89dB Separation Rate-70dB Distortion-1% Frequency Response-60Hz-20KHz Speaker Unit-2x2" Dimensions: Width x Height x Depth 15 x 8 x 9 cm Weight 350/300 g.