Color: Silver Portable and foldable 6 speed height adjustment Non-Slip silicone bottom Height adjustment range: 5.5cm-15.5cm Material: ABS + aluminum alloy + silicone Function: Laptop heightening bracket and cooling pad Portable and foldable Hollow bottom heat dissipation Multi support design Support for laptops up to 15.6 Support most tablets;can aslo support books and other items The bracket is retracked by about the size of a paper folding fan for easy carrying