via this listing
This one was spotted and sent in via
M Me.

Perfect for your Youtube video or synth channel.
Rare opportunity to own one of a kind synthesizer keyboard.
This is the Behringer Kobol Keyboard. There's a label in the back showing this to be an "Engineer Sample".
All controls and keys seem to be working. Although given this is not a production model, there could be quirks. The Pitch and Mod wheels light up when activated. The LED bar changes when knobs are turned.
I had tested only the audio outputs - headphones, main out, and amp out. Other connections and USB are untested.
Good overall physical condition, but there are very visible scratches and dings and dents on the panel, as shown in the photos.
The back stand has 3 positions for tilt adjustment."