I would recommend going to the Apple site and watching the video about Apple Watch. I have used an Apple Watch for years and have this $399 version. I use it to show temperature on my watch face as well as my activity progress, time and date. I really enjoy the fact that it shows my activity - how many calories I have expended, how many minutes I have exercised, and how many hours I have stood.. It does a great job with showing texts, controlling music or audiobooks that are playing on the phone, tracking work out whether at the gym or walking outside. It will show a map of where are you have walked outside. it also shows incoming phone calls and calls can be answered or declined from the watch. it is a powerful and enjoyable little piece of technology.