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. Key Details: Nano USB provides 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 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).