You’ve never seen a watch like this. Always-On Retina display The Apple Watch Series 5 display never sleeps, so you can always see the time and information that’s most important to you. The viewing area stretches deep into the rounded corners and is over 30 percent larger than the Apple Watch Series 3 display. The Apple Watch Series 5 case is 11 percent thinner than the Apple Watch Series 3 case and is available in a range of materials. High and low heart rate notifications, Irregular heart rhythm notification, ECG app Apple Watch Series 5 can alert you if it detects unusually high or low heart rates or an irregular rhythm. It can measure your current heart rate. And using the electrical heart sensor, the ECG app is capable of generating an ECG similar to a single-lead electrocardiogram. Emergency SOS, Fall detection, International emergency calling With Emergency SOS, you can quickly call for help and alert your emergency contacts.2 Apple Watch Series 5 can also detect if you’ve taken a hard fall, then automatically call emergency services for you. And it can complete an emergency call while you’re traveling abroad. Apple Watch Series 5 has both an optical heart sensor for measuring your heart rate and heart rhythm and an electrical heart sensor that enables the ECG app. The Digital Crown provides haptic feedback when you turn it. The S5 chip is up to two times faster than the one in Apple Watch Series 3. And the speaker is 50 percent louder. Electrical heart sensor, Optical heart sensor, Dual-core S5 chip, Digital Crown with haptic feedback, Cellular connectivity on GPS + Cellular models, GPS, Compass Apple Watch Series 5 has both an optical heart sensor for measuring your heart rate and heart rhythm and an electrical heart sensor that enables the ECG app. The Digital Crown provides haptic feedback when you turn it. The S5 chip is up to two times faster than the one in Apple Watch Series 3. And the speaker is 50 percent louder.