Here is smart sensor that lets you monitor your indoor and outdoor cycling workouts on your phone. The SunnyFit CB100 Cadence / RPM + Speed Sensor syncs to your phone or tablet via ANT+ and Bluetooth. To install it, you simply have to place it on the rubberized mat and wrap it around your bike’s crank with the included bands.
More gadgets like this: here
The companion app gives you access to hundreds of lessons. You can also use it to view and track your data in real-time.
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