Product Description The Wheel Sensor by Cannondale measures your speed The tracks your speed and distance travelled. It is attached to the spokes with the help of a 2 mm hex tool near the hub, various adapters are included for this purpose. Transfer the data via ANT+ or Bluetooth to the Cannondale app on your smartphone, Garmin computer or other receptive device and analyse it. Information regarding the return of batteries and electrical equipment:Information on the return and disposal of used batteries and electrical equipment can be found here. Technical Information:Power Source:1 x battery (CR2032)Battery Life:1 year for 1 hr / day in useWaterproof:1 ATM (up to 10 m)Data Transfer:ANT+, BluetoothFeatures:including various mount adapterstransmits data to the Cannondale Appcan also be paired with Garmin or other ANT+ or Bluetooth devicesreplaceable batterydeveloped in cooperation with GarminManufacturer Number:CP1500U10OS Contents:1 x 3 x adapter mounts3 x adapter clamps6 x bolts1 x CR2032 batteries Manufacturer: Cycling Sports Group Europe B.V. Geeresteinselaan 57 3931 Woudenberg Netherlands info@cyclingsportsgroup.com