The Garmin Forerunner® 45S GPS Running Watch is the smaller-sized GPS running watch with all the running-related features you need in a sleek, lightweight smartwatch that youll want to wear all day and night. This easy-to-use running watch is perfect for daily runs, training sessions and even that upcoming 10K you got talked into. Built-in GPS tracks where you run and gives you accurate stats, including distance, pace and intervals. And its intuitive button interface makes it easy for sweaty hands to mark a lap or pause the timer. Forerunner 45S also monitors heart rate at the wrist, day and night.