Kinter MA-170 2-Channel Handover HI-FI Stereo Audio Mini Amplifier With bass and treble knob to control low and high frequency sound. DC input: 12V Max. Speaker Impedance: 4-16n. Output power: 20W*2. R.M.S Power: &lt;0.1% at kHz. SNR: 70dB Color: Red. Dimension: approx. 12.6x10.5x4.4cm/5.0x4.1x1.7". Suitable for CD, DVD,PC or MP3, etc.