Golf sensors aren't a new idea — we've written about a couple of them before — but we've never seen one that didn't need to attach to your club. Until now. The Zepp Golf Sensor hooks onto your glove and communicates with your phone or tablet over Bluetooth, letting you see your swing in 360 degrees, and analyze your club plane, hand path, speed, tempo, backswing position, and, if you put your phone in your pocket, hip rotation. You can also compare your swing with that of a pro, and track your progress over time with every club in your bag. And if you happen to be a multi-sport star, don't worry — the same sensor can be mounted onto a tennis racket or baseball bat so you can track your stats there, too.