As for the functional of the clock, it developed into a pocket watch in order to check the time in the past, which can know the time at any time. Later, due to the inconvenience of carrying, some people began to try to use the belt and buckle to fix the pocket watch on their hand, and then developed into a watch. In 1969, the appearance of quartz watches made watches become gradually widespread in the market, and the price decreased accordingly.
Even if in 1973, LCD electronic watches showed up, and began to have functions other than time, such as alarm clocks, dates, etc., and in 1990s, in response to different requirements, it developed into highly functional watches such as radio-controlled watches, mountaineering watches, etc., and even had strong functions such as computers and databases.
In recent years, the popularity of the Internet has led to the rapid development of smart watches, and has functions exceeded the meaning of the product itself, such as replying to messages, recording health status, …etc. All kinds of data collected from the information system and sensors of the watch are transmitted to mobile phones, computers, or the cloud. Through data re-analysis, it can predict, warn, or further understand the user's status, so that smart watches can assist more people’s life, not just a function of checking the time.