Garmin Forerunner 45(S)

Overview:
Monitors heart rate at the wrist1, because a finger on the pulse is so old school.
For concrete proof that you crushed it, GPS tracks pace, distance, intervals and more.
Get yourself on the road to glory with free Garmin Coach adaptive training plans.
Say goodbye to missed texts with smart notifications delivered right to your wrist.
We’ve got your back with built-in incident detection and assistance features.
Log more miles between charges with up to 7 days of battery life.
Options:
Case Size refers to the diameter of the watch housing (39mm or 42mm).
39mm is the Forerunner 45S.
42mm is the Forerunner 45.