Computes and Transmits Meaningful DataComputes and sends 6 running dynamics metrics to your compatible deviceBattery life: replaceable battery lasts up to 1 year (assuming 1 hour daily use)Automatically turns itself on and offTiny size: at less than 0.5 ounces, you’ll forget it’s thereCompatible devices connect² with the Garmin Connect™ Mobile app to automatically sync your data and connect with others