Here is another compact exercise machine that gets your feet moving under your desk. The YOUNGFIT Under Desk Elliptical has automatic/manual modes with bidirectional motion. It has 5 speed levels for you to choose from. It has a LCD display to show speed, distance, and time.
This elliptical comes with 4 working patterns. It has a retractable handle that you can use to easily move it around. It has a noise rating of under 30lbs.