A dolly that allows you to move your laptop freely on a tabletop. The ball on the bottom allows you to move your laptop with light force. The ball is only attached to the back side, so just lightly float the knob in the front and it can be moved and fixed in place. Easy to move with just your fingertips, so you can use your desktop efficiently. You can rotate the computer screen in negotiations or meetings, or use the space in front of the table without changing the sitting position. It can make work more efficient.