Wahoo RPM Cadence Sensor (Sort)
The Wahoo RPM Cadence Sensor is a lightweight sensor that measures your bike cadence.
The small sensor includes both Bluetooth 4.0 and ANT +, which allows data collection for all the popular apps that you use. For example to Strava and Garmin.
They can both send send data via Bluetooth or ant +. The sensor weighs less than 7
grams and can be mounted on the pedal arm.
You can watch a video about it here: