Designed for right-handed users with small to average-sized hands. Quiet-click left and right buttons support a quieter work environment. Includes 6 programmable buttons. High-definition optical sensor with 1000, 1600 and 2400 DPI settings. Buttons and scroll wheel have been tested for durability. Outer case contains 60% post-consumer recycled plastic. FSC® certified packaging. 3-year limited warranty.