The Marathon Mouse M705, as the name suggest, offers a long battery life of up to three full years. It has a compact, right-hand design and offers thumb buttons.
The Wireless Mouse M505 is ergonomically designed shape with soft rubber grip. It has 15 month of battery life.
The Marathon Mouse M705 will be available in early 2010 for %69.99 and the Wireless Mouse M505 in August for $49.99.