CERTIFIED REFURBISHED: This manufacturer-refurbished unit shows limited (if any) wear and has been fully tested to deliver the same reliable, like-new performance. It arrives with all essential components and is backed by a 90-day warranty for your peace of mind. Premium GPS Running/Triathlon Watch with Wrist-based Heart Rate Offers advanced running and multisport features in a comfortable watch you can wear all day, and it only weighs 49 grams Provides elevation changes with a built-in barometer; altimeter and electronic compass help you keep your bearings Evaluates your training status to indicate if you’re undertraining or overdoing it and offers additional performance monitoring features Provides advanced dynamics² for running, cycling and swimming, including ground contact time balance, stride length and more Battery life: up to 2 weeks in watch mode, up to 24 hours in GPS mode, up to 50 hours in UltraTrac mode (with wrist-based heart rate), or up to 60 hours in UltraTrac mode (without wrist-based heart rate)