The V7 Deluxe Wireless Optical Mouse is designed for total comfort and performance. Featuring adjustable dpi up to 1600dpi ensures smooth and precise tracking. The ergonomic design contours to the shape of your palm and the mouse has 6 buttons for productivity. It also features a fast-scroll wheel for making scrolling through long docs and web pages a snap. Additionally, 1-AA battery is included so its ready to go right out of the box.