• Dual band Bluetooth Smart (4.3) / Ant+ cycling speed/cadence sensor • This sensor with an App combination transforms your iPhone, iPad, iPod touch or Android device into a powerful cycling computer • The Wahoo Blue SC's exciting new odometer functionality tracks the lifetime distance of your bicycle and stores the data in the device • Using the free Wahoo Fitness odometer App, you can sync all your data once in range of your smartphone and see the lifetime mileage of your bike by week, month and year • Durable and easy to use • Small with low drag profile • Sends and receives signals up to 10 feet unobstructed • Waterproof up to 5 feet • Replaceable 3 volt CR2032 coin cell battery • Wireless: Bluetooth Smart/Ant+ • Compatible Devices: iPhone 4S & newer, iPad 3 & newer, iPod Touch 5th gen & newer, Android Samsung S3 & newer, HTC One, plus select LG, Motorola, Nexus and Sony models • 107 grams