This is an early production model of the EWI4000. It's in mint condition. I've checked its operation from time to time, confirming MIDI connection to a computer, sound data transmission and reception via an editor, and sound changes. I've handled it while wearing gloves. Comparing it with my everyday EWI (4000sw), the brass sensor, bite sensor, keys, octave keys, portamento key, side keys, and battery box (no liquid leakage) are all functioning properly. The instruction manual, editor, and various data can be downloaded from the Akai Professional website. The original box is not included, so I will pack it securely for shipping. Thank you. Reference Videos: https://youtu.be/eQrwUsYiEP0 https://youtu.be/BVPwcGJUlzM https://youtu.be/tqxlLrKngaQ