Apple Watch Series 3 requires an iPhone 6 or newer version, along with iOS 13 to run. The aluminum case’s diameter is 38mm, a compact and powerful device equipped with GPS, a dual core processor, W2 chip, barometric altimeter, 8GB of storage, heart rate sensor and Bluetooth 4.2 and an up to 18-hour-life battery. You can dive with the watch for up to 50 meters, record your heart rate, auto workout detection, control your apple music usage and reach out to any emergency SOS service.