IOGEAR's USB Optical Calling Mouse is a very convenient tool for mobile professionals. With a built-in microphone, you can make Free Internet calls by speaking to the mouse wherever there is Broadband Internet access. It works with all Internet call programs such as Skype, MSN Messenger, etc. The 800 dpi resolution offers twice the accuracy of standard mice thereby needing just inches for accurate movement. It works on most surfaces, so no need to carry around a mouse pad. The ergonomic contour design offers comfortable use for hours; moreover, its greater speed reduces excessive and potentially harmful arm movement. This unit is USB ready, Plug-n-Play, and Hot Pluggable. It is also backed by IOGEAR's 3 Year Limited Warranty.