Built-in amplifier delivers 100W max power over 4 channels</br>Plays digital MP3 and WMA audio from USB and SD/SDHC memory cards</br>USB port provides a quick and easy connection for MP3 players or USB memory sticks</br>AUX audio input for use with smartphones?? tablets?? MP3 players?? and other devices with a 3.5mm headphone jack</br>AM/FM radio