[Extension] It enables you to fully support your arms, relax your upper limbs, and improve working conditions. Several improvements were made to the design to find the best ergonomic solution. [Save More Space] It can be used as a platform for printers or speakers, a keyboard tray, or an additional storage surface, which can help you save more space to place other things. [Easy to Store] You just need to press the release lever to fold it up for storage. And the reinforced K-shaped bracket provides rigid support for reliable writing or resting surfaces and can hold up to 50 kg. [Nice Folding] You can fold just by pressing the button with both hands, and the 90-degree folding design saves desk space when not in use. [Different Uses] It is able to increase the width of the book desktop and reduce computer radiation.