Keep track of time and listen to your favorite tunes while exercising with this black Fitbit Charge 4 activity tracker. The built-in GPS tracks your outdoor runs, displaying the distance covered, while the intuitive touchscreen delivers vivid visuals and easy operation. Features Measures calories burned and heart rate To help you monitor multiple fitness activities. Comprehensive monitoring Tracks time, activity, sleep activity, pace and sleep stages. Sleep tracking Track sleep stages and review your in-app Sleep Score for an easy way to see how well you slept. Backlit LED display For easy viewing in low-light conditions Fitbit Pay Allows to make secure purchases at transit stations, retail stores and more. Active Zone Minutes Alerts you to which heart rate zone you're in so you can see if you're working hard enough to reach your goals. Built-in GPS Allows to see your pace and distance on screen during outdoor runs, rides, hikes and more. Water-resistant design Lets you log pool workouts. Syncs to select Apple and Android devices Such as iPhone, iPad, iPod touch and cell phones and tablets with Android for simple wireless communication.