If the cadence and speed are used together, you need to buy two devices. In speed mode, you need to set the wheel diameter in the cycling computer or apps,so that the speed data is accurate. You need to take the battery out to switch the cadence/speed mode.
Speed & Cadence Dual Sensor
Water-proof IP67
Meet daily waterproofing needs Do not soak and pressure highly while cleaning
Powerful Compatibility
Garmin sports watches head units(bike computer) Bryton ZWIFT BKOOL IGPSORT ONELAP TACX & VIRTUAL CYCLING TRAINING SPFTWARE
Product size:41x34x10mm Product net weight:9.5g Battery:CR2032 220mAh Battery life:320h for speed mode,320h for cadence mode Waterproof grade:IP67 Working temperature:-10~50 Communication:ANT+ & BLE 4.0 Measurement extremun:120km/h for speed,300rmp for cadence Outer case:ABS Color:Black
Standard parts
1*sensor 2*flat rubber pad 1*CR2032 battery(pre-installed in sensor) 6*small rubber elastic ring
Installation for speed mode
Buckle the curved rubber mat onto the back of the sensor, then bind the sensor with the large rubber band onto the wheel axle.
Installation for cadence mode Buckle the flat rubber mat onto the back of the sensor, then bind the sensor with the small rubber band onto the pedal crank.