Product details:

Reach your goals faster with accurate information about your training. With the 4iiii Viiiiva, you finally have the heart rate monitor you've been searching for all along. [Details] Built-in Liiiink technology turns your Smartphone into a running/cycling computer, sending all of your ANT+ date in real time to a plethora of fitness apps. Pair with the Sportiiii training display for extreme training program customization and control. Works with ANT+ devices such as Garmin, Timex, and adidas. Includes a free iPhone app for ANT+ sensor management. Gets over a year of battery life from one coin cell battery.