Wahoo TICKR RUN Heart Rate Monitor, Bluetooth / ANT+ Personalized Heart Rate Training  Work out efficiently - view real-time heart rate, training zones and calories burned on your smartphone or tablet with compatible training apps. Ideal For Runners - Built-in accelerometer measures running form across three dimensions to help you improve your individual form and become a stronger runner. Treadmill mode tracks speed and distance while on the treadmill. Dual Technology - ANT+ and Bluetooth 4.0 capabilities allow TICKR to connect to smartphones and tablets, as well as GPS watches by Garmin, Polar, and more. TICKR works with iPhone 4S and later, and with select Android devices using Android 4.3. Pair with Wahoo Runfit and other compatible third party apps to personalize heart rate training zones and maximize your workout. Works with over 50 Smartphone Apps including Nike+ Running, MapMyFitness, Runkeeper, RidewithGPS, and Apple Health. Apple Watch Integration - Pair directly with the Apple Watch to track heart rate or sync heart rate data through the Wahoo 7 Minute Workout app or Wahoo RunFit app.