"Summer Wind" and "Hawthorn Tree Love" are suitable as alarm clock ringtones.

An alarm clock is a clock with an alarm device. It can not only indicate the time, but also send out audio signals or other signals at the time scheduled by people. There are two main types of alarm clock movement structures: mechanical and quartz electronic.

Other types such as transistor balance spring type, tuning fork type and other types are rarely used. They are usually placed on a table and are called desktop alarm clocks, and those mainly used for travel are called travel alarm clocks.

The time and day error of daily mechanical alarm clocks is generally within 120 seconds/day, and the time and day error of quartz electronic alarm clocks is generally within 0.2 seconds/day.

There are many types of alarm clocks, mechanical and quartz. Since they were invented using the principle of a pendulum, they have become an indispensable item in people's lives.

In ancient China, there were sundials, water clocks, fire clocks, copper pot drippers, etc. These can only be regarded as timekeepers of the ancients. Without the ticking sound of a clock, it cannot be called a clock.

In 1090, Su Song, the prime minister of the Northern Song Dynasty, presided over the construction of a water-borne instrument platform that could tell the time and ring the clock. Its structure was similar to that of a clock, and it can be called the originator of clocks. The error is only one second per day.

It has an escapement, and it is the escapement that makes a ticking sound when it works. This is the difference between a clock and a timer. The international watch industry regards the escapement as the heart of the watch.