With the Fellowes Professional Series Sit / Stand Keyboard Tray, you can work in either a "sitting" or "standing" position. Height can be adjusted for taller users (up to 6-1/4" above desktop) and the range of motion below desk is 5" for custom knee clearance. A simple one-handed motion instantly repositions keyboard height without locks or levers. The 10" round mousing platform mounts over your keypad or flush with keyboard for easier mousing. Leatherette keyboard palm support with Microban antimicrobial protection keeps product cleaner.