Garmin Bike Cadence Sensor 2, Wireless Sensor that Measures Pedal Strokes per Minute with ANT+ Connectivity and Bluetooth Low Energy Technology, Black : Amazon.co.uk: Sports & Outdoors
The ANT+ Bike Speed/Cadence Sensor: Everything you ever wanted to know | DC Rainmaker
GARMIN (GB) | Bike Speed Sensor 2 and Cadence Sensor 2