With the Apple Watch Series 3, you'll stay active, motivated, and connected. The smartwatch has a GPS sensor and altimeter. This means that, in addition to distance and speed, it also shows your altitude and the route you've taken. Thanks to the improved Dual-Core S3 chip, the watch is faster than its predecessor and you can communicate with Siri from your wrist. The integrated heart rate sensor measures your heart rate all day long. In addition to your current heart rate, you can also see your heart rhythm in a graph. This allows you to learn more about your endurance, your workout's intensity, and your recovery. You can easily view incoming calls, messages, and notifications with this watch. Moreover, Apple Watch Series 3 is completely waterproof, so you can even wear it while swimming.The Apple Watch is suitable for a wrist between 140 - 210 millimeters. Note: to use Apple Watch, you need an iPhone 6S or newer.