The Wireless Mobile Mouse 4000 from Microsoft features laser-like accuracy that can be used on almost any surface, even carpet. The wireless mouse is ideal for travel and requires no cords or cables. Its ergonomic yet compact design makes it easy to use without straining your hand or wrist. Additionally, the thumbnail-sized transceiver is small enough that you can leave it plugged into your computer even in transport so the mouse will be ready for use as soon as you turn on the computer. You can also stow the transceiver in the mouse itself. The Wireless Mobile Mouse 4000 features 4 customizable buttons which can be assigned to specific tasks such as cut and paste, or specific programs such as task manager or a media player.