The legendary drumKAT allows the user to stack up to 8 notes on the same pad, and create chords and melody lines in one simple step with melodic modes. The operating system is powerful, full featured and intuitive. The drumKAT offers the most advanced software with the greatest power of expression and programmability for the needs of the professional or casual user. Features true FSR technology. Perfect supplement to your acoustic drum kit!

Unit dimensions: 17.25″ x 12″ x 2.5″

Source: http://www.alternatemode.com