Bought this watch about 8 weeks ago to measure distance when swimming in open water. However, this watch literally saved my life. I fell hard on Nov 13, but didn't even know and I staggered inside. My Apple Watch SE 3 called 911 and my two emergency contacts. I had gone inside and was surprised when EMTs showed up - I literally had blood dripping from head and face, but was unaware. My DIL (an emergency contact) immediately called me and noticed I has slurred speech, but she discovered 911 was already on the way. I went into ICU where I learned I had fallen, I had a brain bleed/concussion, facial fractures, a large hematoma, many bruises, lumps, bumps and scrapes. If my watch had not called 911, I would have stayed inside with a brain bleed until it was too late!!! I am trying to tell everyone to buy an Apple Watch if only for this feature.