Amazon.com : POWR LABS Bike Cadence Sensor for Stationary Bike & Road Bike, Smallest & Lightest Bike Sensor Bluetooth ANT+, Compatible with Wahoo, Garmin, KICKR, Polar, Bike Speed Sensor Bike Accessories :
V800 User Manual | Changing Heart Rate Sensor Battery
Speed Sensor and Cadence Sensor Set | Polar Global