USB host USB MIDI sound module MAXIMUM POLYPHONY: 64 notes INSTRUMENTS: 128 GM List Sound DISPLAY: 3 Digital LED JACK: Headphone(LINE) OUT?? MIDI IN?? USB host?? Micro-USB POWER SOURCE: Micro-USB(?500mA) BATTERY CAPACITY: 2500mAh</br>INPUT/OUTPUT HEADPHONE(LINE)OUT: 3.5mm stereo headphone jack MIDI IN: MIDI input jack U