Mobile Standing or Adult School Desk quickly and easily adjusts in height, without electricity, to provide a healthier option of standing wherever you work or learn. Professionals and students focus better when they can move. Desktop rises up to 49" and lowers down to 31" (above floor) to optimize the ergonomic work position. 40" wide top can hold up to two monitors, a laptop and more. For ideal positioning when seated, retractable keyboard tray (40" x 11-1/2") sits 4-1/2" below the desk (26-1/2" above floor at lowest position) to help keep arms and wrists in an ergonomic position. Use large top as stand-alone desk or as extension to your current desk. Grommet hole on tabletop allows you to route cables or install a monitor arm. Mobile standing desk includes stationary feet and locking casters so you can create a fixed or mobile workstation. The desk is faster to raise and lower than an electric sit/stand desk, and you don't need an electrical outlet nearby.