V220 Cordless Optical Mouse for Notebooks - Scarlet Red- Ergonomically designed with soft rubber grips, contains mini-receiver that snaps on to the mouse and turns it off for optimum battery life (up to 6 months!) Top-notch tracking gives you more responsive scrolling with 1000-dpi high definition optical technology. Side-to-side scrolling plus zoom minimizes moves from the mouse; battery indicator light helps keep an eye on power.