DESC: The ShuttleXpress is designed for ergonomic integrity and maximizing productivity, allowing one-hand access to the five (5) fully programmable buttons and jog/shuttle knob. The inner ring or 'jog' rotates through 360 degrees and provides precision frame by frame control. The outer black ring or 'shuttle' is rubberized and spring-loaded. It facilitates fast forward and rewind. You can also use the jog and shuttle for many other purposes such as scrolling, volume control, and sequencing.