The Bike Speed & Cadence sensor is specially designed for Bike cycling lovers. With it, the users can actually know their riding speed, cadence and distance. At the same time, the product is works with the most popular cycling APPs on the market today, such as Strava, Wahoo. Features: 2 IN 1 SPEED/CADENCE SENSOR: by removing and replacing the battery you can switch between cadence and speed sensor modes. BT 4.0 & ANT+ TECHNOLOGY: You can see your exercise data by connecting this sensor with any devices which support BT4.0 or ANT+. ULTRA SMALL DESIGN:38 * 29.5 * 9.5mm / 1.5 * 1.1 * 0.3inand weighs only 9.2g / 0.3oz, you wont feel any burden when cycling. AUTO START AND STOP: After connection with device, data such as gradient, speed, distance and duration will be shown on the device. It will power down to sleep mode when not in motion, and has a maximum standby time of 300 days. EASY INSTALLATION: Easy to install and remove, simply attach the sensors and ride,no magnets. COMPATIBLE APPS & Devices: App: WAHOO/STRAVA; Watch: for SPOVAN / for GARMIN / for CATEYE; Stopwatch: for GARMIN / for TOMTOM / for BRYTON; Bike Trainer: for ZWIFT / for TACX / for BKOOL. Specifications: Material: ABS Color: Black Battery: 2 * 3V 220mAh CR2032 (included) IP Rating: IP67 Standby Time: 300 days Continuous Working Time: 300 hours Measuring Range: 0-90km/h 0-200rpm Size: 38 * 29.5 * 9.5mm / 1.5 * 1.1 * 0.3in Net Weight: 9.2g / 0.3oz Package List: 1 * Cadence/Speed Sensor 2 * Rubber Mat 2 * Rubber Band 2 * Battery 1 * User Manual