The FM & MP3 Stereo Receiver delivers high quality sound at 20 Watts x 4 of Max Power. Playback your favorite music from removable storage devices using the USB Port and SD Card slot. Front AUX in allows you to playback audio from your iPod, iPad, or MP3 player. Easily Play MP3 files from an SD card or USB flash drive. FM Radio with 18 presets. Half size DIN Depth for easy installation. Pre-amplified line-out. 4 Channel Audio Output. Electronic Audio Control.