This Bike Speed & Cadence sensor is specially designed for Bikecycling lovers. With it, the users can actually know their ridingspeed, cadence and distance. At the same time, the product is workswith the most popular cycling APPs on the market today, such asStrava, Wahoofitness, and MapMyRide. 

Features:
WATERPROOF: IPX7 waterproof grade, you can enjoy your riding withit even in rainy days.
BT 4.0 TECHNOLOGY: This device is a BT Smart and ANT+ device,widely compatible with smart devices with BT 4.0 or newer, forAndroid 4.3 or newer, for IOS 6.0 or newer. Speed / cadence /distance data can be shown on your mobile phone.
ACTIVE TRACKING: When you are riding, Cycling speed, cadence anddistance data will be all shown on your smart device.
AUTOMATIC START: When you are riding, the device can auto transmitand sync to your smart phone and also it can be auto off when youare not riding, Save lot of energy. 
LOW-POWER: This item powered by 1 CR2032 cell battery and can lastabout 6 month.
COMPATIBLE APP: the product is works with the most popular cyclingAPPs on the market such as Strava, Wahoofitness and MapMyRide.

Specification:
Battery model: 1 * CR2032 (replaceable)
Device requirement: BT 4.0 or newer, for Android 4.3 or newer, forIOS 6.0 or newer
Material: ABS
Package size: 123 * 111 * 44mm / 4.8 * 4.4 * 1.7in
Package Weight: 90g / 3.17oz

NOTE: When you get our product, please make surethe operations follows:
1. Install this bike sensor correct according to theinstructions.
2. Download APP WAHOOFITNESS/STRAVA/MAPMYRIDE and turn on yourdevice BT.
3. APP shows the data only when you cycling and make sure thedistance of bike sensor between app have to below 10 Meter, soplease hold your smart device when you cycling.
4. Some buyers told us they only got the half speed compare withthe normal when they are riding, after we test all the apps, wefound that their wheel perimeter is not suitable. Every wheelspecification is not the same, you can find it on your bike'swheel, So Please modify your wheel perimeter on the app to avoidget the wrong data.