Kinter KAWACHI D22 12V HI-FI Amplifiers Car Computer Amplifier Support USB/FM/MP3/Microphone Out-put Power :30W*2 Minimum THD :&lt;0.05% Support: USB/FM/MP3/Microphone This amplifier is small to take at hand,you can play by computer at home,or in your car. Equipted with Microphone input socket, you can sing at home freely.