The PFA400U is a class-T digital amplifier with up to 100 watts of power. Use it in your car, your boat, your RV, your golf cart, your home ? anywhere you need a great amplifier with low distortion and acoustically accurate reproduction of music. Plus, the PFA400U is equipped with an SD card slot and USB port, so you can plug in a card or stick with your favorite MP3s already loaded. Adjust the bass and treble to your liking, or bypass the included EQ. Has RCA inputs that can be used as an iPod/MP3 input along with a 1/4" microphone jack. 2-8 Ohm speaker impedance compatible. Includes a 12- Volt DC adapter.