Essential health features — The temperature sensing feature provides more detailed information in applying biomarkers and ovulation estimates based on previously observed data. You’ll also get your daily sleep score, sleep apnea alerts, and heart rate alerts. Then charge up to twice as fast as the SE 2 and get up to 8 hours of battery life in just 15 minutes | Always-on display — you can now see the time and watch face without lifting your wrist to activate the display | Your powerful fitness partner — the SE 3 offers you many healthy ways to track your workouts. With instant measurements, you’ll be able to achieve your goals like never before | Stay connected — you can send messages, answer calls, listen to music, podcasts, use Siri, and get notifications. The SE 3 (GPS model) works with your iPhone or Wi-Fi to keep you connected | Safety Features — The SE 3 can detect your exposure to a heavy fall or a serious car accident, and can automatically help you contact emergency services and notify the people you have designated as emergency contacts. The reassurance feature lets you send an automatic notification to a loved one alerting them to your destination | Your watch, on your way — Express your taste with dozens of easily customizable interfaces and a wide range of straps in multiple designs, materials and colors