Amazon.com : Bike Speed & Cadence Sensor for Spin Bike or Road Bike , Wireless Bluetooth/ANT+ IP66, Bike Computer RPM Sensor Compatible with Garmin ,Bryton ,Wahoo IGPS, Black, 38.3*29.8*8.9mm : Sports &
XOSS X1 Suite Speed/Cadence Sensor for Cycling, ANT+/Bluetooth 4.0 Wireless Bicycle RPM Speedometer and Cadence Sensor for Road/Spinning/Stationary Bike/MTB Compatible with Wahoo/Garmin/Zwift/Strava