Does the stand-up desk with double drawers come in a box with tools to assemble the upright desk?

All standing desk boxes include the tools needed for installation, and you can follow the installation video or installation manual to quickly complete the installation in less than 30 minutes!

What is the drawer width and writing space of the adjustable desk with storage?

The desktop size of our two drawer standing desk is 24*40, 24*48" and 24*55", 24*63, the drawer size is 11.81IN x 3.94IN x 10.63IN, the two drawer storage and heightened shelves are fully able to satisfy your work and study needs.

If the motor (or power supply) of the sit-to-stand desk fails, is there a manual function?

Not that I know of, you need to wait for power to be restored before you can adjust the height!

What is the adjustable height and maximum load capacity of this standing table?

The adjustable height range of this electric stand up desk is 28.7"-48" and the maximum weight capacity is 176 lbs.