Up for sale is a pre-owned M-Audio Oxygen 49 MKIV USB MIDI Controller Keyboard. This unit is in good condition with normal signs of previous use, including minor scuffs and some yellowing of the keys from age-related plastic oxidation (a common cosmetic change that does not affect performance). The keys are fully responsive, and all pads, knobs, and faders work perfectly—ideal for DAW control and music production. It has been tested and verified to operate properly. Comes as shown in photos. This listing includes the Oxygen 49 MKIV Controller ONLY. Please review all pictures for exact cosmetic condition and details. THANKS!