Logitech Wireless Mouse M505 (Red) Extended battery life: Batteries can last up to 15 months, among the longest in the industry. Laser tracking: Delivers smooth, responsive, precise cursor control, even on polished or wood-grain tables. Unifying receiver: Tiny Logitech Unifying receiver stays in your notebook. Ergonomic design: The mouse shape with soft rubber grip conforms to your hand to be naturally comfortable, Cordless convenience: Advanced 2.4 GHz wireless gives you the reliability of a cord plus cordless convenience and freedom.