The SwingSmart system is a golf swing sensor combined with an app that captures and analyzes every part of your swing.
Once you've connected the sensor and downloaded the app you're able to see your tempo, swing speed, face angle, angle of attack and club shaft lean. The app even gives you a 3D visual of your swing from any angle. SwingSmart saves every swing you record and labels them "best" to "worst" so you can see what you're doing right and where you can improve.
You're instantly able to see your swing on the app so you can even fix your swing between holes. You can see a short demonstration of how easy this is to use in this video. This little device combined with the SwingSmart app is the best self-training device for golfers out there.