midiplus Easy Piano 49 keys USB MIDI keyboard with sound 49 velocity sensitive piano-style key. Built-in Sound MIDI keyboard USB powered works as MIDI keyboard controller MAXIMUM POLYPHONY: 64 notes 128 GM sound built in 6 fast access sound Program Change, cave Up / Down Pitch and Mod wheel MIDI input and out jack USB B type: USB connect to Computer JACK: USB B Type, AUX OUT , Headphone, MIDI IN, MIDI OUT, SUSTAIN POWER SOURCE: USB (no speaker sound), DC 9V, Batteries ATTACHMENT: Owner's manual, USB cable made in Taiwan