Laptop and/or monitor & keyboard desk riser allowing you to stand up whilst working.

Great device, very smart, and just sits on your desk. Lowered for sitting working, and raised up for standing working.

Perfect condition; but I've swapped to a single level one now (rather than two tiers) as it suits my new setup better.

From the FlexiSpot website:

"Turn any desk into a standing desk with a fully assembled Flexispot desk riser.If your budget is limited, if you want to keep your original desk, but you still want to change your sedentary work style, then the desk riser is the best of both worlds solution.

Quick-release, removable keyboard tray

Easy one-step attachment and release gives you the option to use the desk riser with or without the keyboard tray."