This sleek, Bluetooth 4.0 and ANT+ enabled cadence sensor is easy to install, connects wirelessly to your iOS or Android device, and displays your cadence data. Simply download the free Wahoo app to your compatible mobile device. Wireless, magnet-less, lightweight, cadence sensor.

http://www.pushys.com.au/wahoo-rpm-cadence-sensor-with-bluetooth-ant.html
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