4iiii!

Let the 4iiii iOS App help you achieve your running, cycling and fitness goals Designed to easily connect you to your activity data, this app is your gateway to personalized sensor configuration, accurate monitoring data and updated key features. Connect and configure:- 4iiii Viiiiva Heart Rate Monitor the unique algorithms of this sensor pick up the most sensitive of heart rates. * Continued use of GPS running in the background can dramatically decrease battery life.