Garmin Forerunner 935

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 dynamics 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)