Make it a better PC with the worlds best selling optical technology for an incredibly quick, smooth and precise tracking. This mouse is the ideal choice when standardizing from ball-based product to performance, optical technology you've come to expect from Logitech.State-of-the-art optical sensors provide the smoothest tracking on most work surfaces. Since there are no moving parts, optical mice require less maintenance and will outlast traditional ball-base mice.The contoured shape is designed for user comfort, and the scroll wheel allows easy navigation of large documents and websites in all common applications.