Wrist-based Heart Rate¹ 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) Who cares that Forerunner 935 gives you rich data like running dynamics, wrist-based heart rate, training status, FTP and VO2 max? A dedicated athlete like you who’s ready to beat yesterday. This premium GPS running/triathlon watch helps you fine-tune your training and recovery to be a better athlete.