Akai Professional MPK88 Hammer Action USB Midi Controller 88-key fully weighted, hammer-action keyboard with aftertouch for expressive melodic creativity 16 genuine MPC pads with pressure and velocity sensitivity MPC pads access four banks each for instant access to 64 samples MPC Note Repeat, MPC Swing, and arpeggiator aid in creative process MIDI output over USB, bus powered, class compliant: plug and play with one USB cable