Ergotron 45-384-026 LX HD Sit-Stand Desk Mount LCD Arm - Mounting Kit 20-Inch (51 cm) height range allows users to move between sitting and standing positions while they interact with the Display Extends LCD up to 33" (84 cm), push your Display out of the way when not in use Increase viewing comfort - help reduce eye, back and neck strain Upgrade LCD monitors and TVs with improved ergonomic adjustment Patented CF motion technology provides premium ease-of-use adjustment