The AK-4400-TU Keyboard Series is a high quality, high reliable Small Footprint Notebook Style Keyboard with an integrated trackball. The high resolution 16 mm Trackball allows smooth and accurate movement of the cursor. New Scissors Balancing Key Technology provides excellent key actuation feeling with soft tactile ergonomic characteristic. Scissors Balancing Technology improves off center key actuation characteristics. Low profile (23 mm) for rack implementation, kiosk applications and all other space critical applications. Compatible to many existing cutouts for similar keyboards with trackball.