The FM and MP3 Stereo Receiver with USB Port and SD Card Slot delivers high quality sound at 80 Watts of Max Power. Playback your favorite music from removable storage devices using the USB Port and SD Card Slot. The AUX in even lets you play music directly from your MP3 Player! Audio output 20 x 4 watts (Max). MP3 playback via USB port or SD card slot. Digital FM tuner with 18 presets. Aux in on front panel. Preamplified Lineout. Half Size DIN Depth. 4 Channel Audio Output. Electronic Audio Controls.