Microsoft Wireless Mobile Mouse 4000 Studio Series - Pirouette Microsoft BlueTrack Technology - Works on more surfaces than optical or laser technology Nano Transceiver - Leave it plugged in your notebook when you're on the go, or stow it in the mouse 4-way Scrolling and 4 Customizable Buttons - Additional advanced features with included software Up to 10 Months Battery Life - Battery status indicator lets you know when your battery is running low Stylish, Comfortable, and Portable - Studio Series patterns combined with rubberized grips for maximum comfort and style on the go