70% of golfers have lost or left clubs behind on the course. Club Catcher solves the problem. Lightweight devices screw into the grips of whichever clubs you want to protect and work with a free mobile app. The devices contain sensors that know whether the clubs are in or out of your bag, and Bluetooth that lets the app know each club’s status. The app monitors clubs going in and out to detect when you’ve left one behind and gives you an alert on your phone and smartwatch.