The M705 Marathon Wireless Mouse boasts up to three years of battery life in addition providing dual-mode scrolling, a secure wireless connection, and a comfortable, sculpted shape.The precision mouse that’s built for the long haul, with a sculpted shape, dual-mode scrolling, and more control so you can tackle any task. An impressive up to 3 years of battery life4Battery life may vary based on use and computing conditions. and secure wireless connection ensure that you can keep going and do the precise, high performance work you do.The full-sized, contoured shape follows the natural curve of your hand, so you can stay productive longer. A right-handed design also features rubber side-grips for added comfort, so you can work comfortably, even for long hours.