The best invention-smart watch

In my opinion the best invention of all time is smart watch. This gadget can make our life comfortable and more easier. We can use it for listening to music, answering to messages, taking photos, measuring our pulse...etc. And also we can easily check the time on our wrist. It is easy to carry this invention with us, if we don't want to keep our mobilephone in our pocket. It can also relieve doing exercises, because we can check our progress on it.