Cycling Computer Speedometer Cadence Sensor Ant+ Bluetooth Computer Speedmeter Bike Computer Bike Intelligent Support Bluetooth & ANT+ XOSS Cadence Sensor track your cadence and speed by earth induction, NO need MAGNETS. Replaceable Battery working time reach 400 hours,can be used continuously a year if you ride 1 hour a day. Please remove the battery insulation film in the cadence before connecting the cadence sensor. Sleek, Lightweight DesignSensors weigh only 10 grams. Perfect for spin class or use with bikes. WaterproofIPX7 Waterproof, enjoy your cycling every in all weather. For Indoor TrainerZwiftTacxBkool For Cycling ComputerTrack and capture real time cycling speed & cadence data on your Bike Computer. For Smart Phone Apps:It can be connected to smartphone cycling Apps by bluetooth:Wahoo , Wahoo Utility, Openrider and bike trainer apps: ZwiftTacxBkool. Specifications: Specifications: : XOSS Products:speed cadence sensor Dimensions: 38MM*30MM* 10MM Battery life: 400 hours Battery: 2032 button cell Working temperature:-20-50 c Wireless fidelity: ANT+, Bluetooth 4.0 Protection grade: IP67 Sensor: geomagnetic sensor Weight: 10G Accessories: sensor, 2032 battery, silicone gasket *2, rubber ring *4 Package Included: 1* speed cadence sensor 4* Rubber Ring 2* Rubber Block 1* Instructions Notes: If you want to know the cadence and speed data at the same time,two sensors are necessary and cheaper