Kinter MA-170 2-Channel Handover HI-FI Stereo Audio Mini Amplifier AMP with 5A Power Supply and Tera Cloth for CD DVD MP3 PC Home Car Use 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.