CatEye's Velo 9 features a large easy-to-read display and one large button for changing modes, making this sleek, wired computer easy to use. On top of all the standard functions the Velo 9 also has a calorie counter to help you track your energy expenditure and a carbon offset calculator to monitor your good will towards the environment. You'll also love CatEye's tool-free Flex-Tight mount for easy installation and removal.