DC 12V USB SD MP3 Player Car Amplifier 20WX2 Stereo Amp + Mic Input & FM Radio This special purchase mini audio amplifier is ideal for both home and car audio applications. Can play the disk SD /MMC card for music and FM stereo radio, support Microphone Mp3 music format.( USB+SD +FM) Select high-power 2 channel professional power amplifier integrated circuits, minimal distortion, strong power Pre-professional level input operational amplifier IC for circuit design, sound , transparent, bright. Voltage: DC 12V,Output Power: 2* 40W.Treble/Bass/Volume control