I’ve been watching these since the end of summer and this is the first real discount I’ve seen on them from a reputable seller.
These attach to the end of your golf clubs and sync with either your Garmin watch or another Garmin device. Then when you swing, it knows which club you used and will measure distance for each along with your total number of strokes.
https://www.amazon.com/Garmin-App…07C3FBNQ4/