Slip Topeak's PanoComputer into its handlebar mount, and all the data you could want is at your fingertips. The included speed/cadence sensor attaches simply to your bike and operates on Bluetooth Smart. Once the ride is over, you can quickly and easily transfer that data to your smartphone to share with friends. The single, large button scrolls through all the computers 17 functions, which are shown clearly on the 2.3-inch screen, and it can store info from two bikes so you can swap it. Don't worry about rain, because the PanoComputer is water resistant.