Apple Watch Series 3

With 50 percent growth year-over-year, the Apple Watch is now the most popular watch in the world and the newest version will have cellular built right into it. You get access to things like Siri and maps without having to drag your phone around. Apple Music is also now compatible with the Apple Watch. 

The Series 3 will cost $399 with cellular built-in or $329 if you don't need that wireless connectivity option. It has a new dual-core processor inside that promises a 70 percent performance increase, but the Series 3 case is actually the same size as the Series 2. The new wireless chip inside is also new and promises increase efficiency.

The heartrate app is getting some upgrades. Now you can see your heart rate on the main screen. It's also getting into measuring recovery heart rate to get a better overall picture of fitness. It will also pay attention to your motion and compare it against your heart rate. So, when you're watching The Fast and the Furious, and you get amped, it'll let you know.

The Apple Heart Study is happening with Stanford Medicine using data from the built-in heart monitor. Apple is trying to get in on identifying irregular heartbeats like atrial fibrillation.

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