Dell MS1166 Optical Mouse : Enjoy smooth, accurate cursor control at 100 dpi with the Dell Optical Mouse. Set up - Just plug and play. Use comfortably in either hand. - - - This Dell MS116 Optical Mouse is equipped with optical tracking with 1000dpi for reliable and accurate performance. Either use it in office or home get a reliable performance every time. - - - The plug and play feature of the product helps you to connect with your system with ease. - - - The Dell MS116 Optical Mouse is designed in such a way that it is comfortable for use even if used for longer periods. Use it with either of your hands either if you are left handy or right handy, - - - The mouse is designed for all purposes uses.