Usb/midi Percussion Pad Controller.8 high-quality velocity-sensitive percussion pads.2 trigger inputs for connecting external pads (compatible with Alesis Drum Pad and Cymbal Pad expansion kits).2 footswitch inputs.Up/down footswitch input.USB Plug-and-Play connectivity (no drivers necessary).USB bus-powered (no power supply necessary when connected to a computer).PC and Mac compatible.MIDI I/O Pad sensitivity adjustment.Stores MIDI setups with program change capability.A/C power adapter included