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The Lenovo wireless mouse N3903 offers exceptional comfort and cordless convenience with it's ergonomic design and the Plug-and-Forget Nano-receiver. It has a feel-good, comfortable ergonomic design and is easily handled with either hand. The integrated on/off button at the bottom of the mouse allows you to conserve batteries (2 AAA batteries included). The plug-and-forget nano-receiver can stay in your computer - plug it in and forget it. Precision optical tracking gives you responsive, smooth cursor control with high-definition optical tracking. It easily tracks on wood, carpet and other difficult surfaces.