Chest strap HRM works with ANT+ and Bluetooth and can be used with a wide range of phones, watches, even Apple TV. Has a built-in accelerometer for cadence and advanced running dynamics, and on-board memory for tracking exercise without a device.

From Wahoo's website: "The TICKR X is the ultimate heart rate monitor and workout tracker, capturing both motion and intensity to give you the most effective workout. It tracks heart rate, calorie burn, rep counting with Wahoo's RunFit or 7 Minute Workout apps and Beachbody on Demand, running analytics and more! It even has built-in memory for heart rate and calorie data, giving you the freedom to train without a phone. Equipped with Bluetooth Smart and ANT+ dual-band technology, it connects to most smartphones, GPS watches and bike computers. TICKR X is compatible with most popular fitness apps, making it an incredibly versatile workout tracker for all of your activities. No other heart rate training platform can compete with the TICKR X. Period."