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The Sigma BC509 Cycling Computer has the features that you need and the simplicity to get you on the road quickly and easily. The Sigma converts between km/h and MPH as well as showing current speed, trip distance, total distance and ride time. While you are on the road, the weather resistant Sigma BC509 has a large display that is easy to read and can be set fixed or scrolling. Connect your Sigma BC509 to your PC and keep track of your training.