For those who want the perfect mix of performance, precision and price. With a micro precise scroll wheel for the ultimate online navigation experience and ergonomic shape. Laser grade precision tracks over the most challenging surfaces, including smooth glossy surfaces, that are problematic for standard optical mice. Includes Logitech M525 Mouse, Logitech Unifying Receiver, 2 x AA batteries, User documentation. Optical sensor. 4 buttons. Scroll wheel. Battery indicator light. Approximately 36 months battery life. Batteries required 2 x AA (included). Manufacturers 3 year guarantee.