The HB-3502U has 7.2 channels, all of which upconvert analog audio sources to digital quality. This amplifier has USB and SD card inputs, as well as an iPod/MP3 input. This means that you can plug right into the HB-3502U and play your songs on your home stereo system. The digital fluorescent output display of the HB-3502U shows you visually where the levels are at. The HB-3502U has the exact same specs as the lower cost HB-1502U and HB-2502U amplifiers, but with 3500 watts of peak power instead of their 1500 watts and 2500 watts, respectively. Like the HB-1502U and the HB-2502U, the HB-3502U comes with a remote control.