The Ergotron WorkFit T Sit-Stand Desktop Workstation which is ready to use straight out of the box at your current desk is the ideal all-in-one system to keep you working in better postures for your body. To transform your desk, simply set on top, raise and lower to your height preferences for an easy way to upgrade your office for better ergonomics with one major desktop annexation. This model is made to fit in smaller, narrower spaces around the office, giving you ergonomic options even when space is lacking. Features Freestanding mount can be added to almost any surface. Works without motors or cranks, and functions using a counterbalance system. System offers great stability and allows for 15" of height adjustment. Saves space and is designed to not extend beyond desktop. Ready to use out of the box (comes fully assembled).