This is an AKAI Professional EWI5000. I bought it because I'm a saxophone player and admired T-Square, but I couldn't master it... It's almost unused, having only been powered on for testing and then stored (to prevent complete discharge, which would require sending it back to the manufacturer). I'm selling it to declutter. It's a great instrument, so I recommend it to someone who can use it. I'm also including a spare battery.