ITEM NAME:Bike Speed Sensor and Cadence Sensor for Cycling APP Sports Watch Support A B5N9 Bike Speed Sensor and Cadence Sensor for Cycling APP Sports Watch Support A B5N9 Easy-to-install: Simply attach the sensors and ride. With no magnets or other exposed parts to line up, these sensors are easy to install, maintain and move between bikes Cadence sensor: Fastens to any crank arm size and measures pedal strokes per minute so you can get the most out of your training Connects wirelessly via Bluetooth 4.0 and ANT+ on your iPhone, Android, and/or bike computer. All-new dual-mode speed&cadence sensor, by removing and replacing the battery you can switch between cadence and speed sensor modes. Designed to work with all bike, riding types and terrains. It works with spin bikes and recumbent pretty easily too. IP66 splash-proof. Name: Bicycle Speed Cadence Dual-Use Sensor Battery: 220mAh, CR2032 Rated voltage: 3.0V Use time: 300 hours Standby time: 300 days Link method: Bluetooth 4.0 ANT+ Measuring range: 0-99km/h 0-200rpm Applicable objects: riding APP, riding platform software, stopwatch, sports watch, etc. Colour: Black material: plastic Size: 38*29.5*9.5mm Package Contents: 1 * blister packing (sensor, rubber gasket, rubber ring,2032 battery) Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.