Velleman VM114 7W Mono Audio Amp Assembled music power output: 7W / 4ohm output: 3.5Wrms / 4ohm or 2Wrms / 8ohm total harmonic distortion: 0.05% (1W / 1kHz) frequency response: 20Hz to 20kHz (-3dB) signal-to-noise ratio: 86dB (A weighted) input sensitivity: 40mV / 150Kohm overload and short-circuit protected supply voltage: 15V DC (8 to 18V DC possible) / 0.5A dimensions: 2.2 x 1.4" also available in kit version: K4001