Check the listing for details. M-Audio Oxygen8 v2 25-Key MIDI USB Keyboard Controller Pitch Mod Faders Knobs. Condition: Used. Listed at 44.43 USD. The M-Audio Oxygen8 v2 25-Key MIDI USB Keyboard Controller is a versatile and compact instrument designed for music production and performance. With its unweighted keys, USB and MIDI output ports, as well as a variety of features such as a pitch wheel, faders, modulation wheel, and knobs, this keyboard controller offers a wide range of creative options for musicians and producers. The digital nature of the Oxygen8 v2 allows for expressive and dynamic control over software synthesizers and other digital audio workstations, making it a valuable addition to any studio or live setup. Please note: This item is tested and fully functional, but the 12v power supply is not included. I use a universal from Walmart that I prefer to hold onto. Thanks!