LENOVO 400 WIRELESS MOUSE Today you\'re at the office, but tomorrow -- who knows? No matter where you are, though, you need a mouse you can rely on: easy to pack, plug in, and use, with simplicity that doesn\'t sacrifice quality. The Lenovo 400 Wireless Mouse gives you it all. Nano USB provides a strong 2. 4 GHz wireless connection Responsive and clear tracking with 1200 DPI resolution optical sensor Up to 8 million clicks for left and right buttons Comfortable and functional in the left or right hand Lightweight for travel at 65 g (2. 29 oz) Battery life lasts up to 12 months (may vary based on usage)