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The Wahoo RPM speed sensor is the sleek, magnet-less solution for capturing cycling speed data. It easily mounts to your bike's front wheel hub, and the Bluetooth Smart and ANT+ dual band technology allows you to connect to and display data on both smartphones and bike computers. Tracking speed data has never been this easy. Visible Connection Two LED lights show the sensor's device connection (blue) and speed detection (red). Replaceable Battery No charging required! Operates on a coin cell battery for up to 1 years.