Desktop rises up to 49" and lowers down to 31" (above floor), to optimize the ergonomic work position for people of all heights. Ergonomic retractable keyboard tray sits 26. 5" above floor at lowest position, for comfortable keyboarding when seated. Use as a standalone workstation or as an extension to your current desk. Wide 40" top can hold up to 2 monitors, a laptop and more. Grommet hole allows you to route cables or to install a monitor arm. Includes feet and locking casters, so you can create a fixed or mobile workstation.