1.The information below is per-pack only 2.A comfortable, ambidextrous shape feels good in either hand, so you feel more comfortable as you work-even at the end of the day. 3.With 800 DPI sensitivity, you'll get precise cursor control so you can edit documents and navigate the web more efficiently. 4.Side-to-side scrolling Plus zoom lets you instantly zoom in or out and scroll horizontally and vertically. Perfect for working with spreadsheets and presentations. 5.Zero setup with flexible connectivity means you just plug it into your USB or PS/2 port-it works right out of the box. Scrolling: Line-by-line scrolling | Scroll Wheel: Yes, optical 6.This mouse is built by -the mouse experts. It comes with the quality and design We've built into more than a billion mice, more than any other manufacturer. 7.Works With Chromebook - The Works With Chromebook badge signifies products that are certified to meet Chromebook compatibility standards, to provide you with a seamless experience.