Purchased as a sub-unit from Soundhouse and hardly used since, so I'm putting it up for sale. It has a built-in sound source and speaker, making it very light and convenient to carry around. - Model Name: MPK mini play MK3 - Brand: AKAI - Number of Keys: 25 keys - Number of Pads: 8 pads - Number of Control Knobs: 4 knobs - Sound Source: Built-in sound source - Connection Terminals: USB, Headphone output - Color: Black/Red Includes the main unit, box, instruction manual, USB cable, and 4 AA batteries. Please check the photos and consider purchasing.