Alarm clock is a clock with alarm time device. It can not only indicate the time, but also send out audio signal or other signals according to people's predetermined time. The movement structure of alarm clock mainly includes mechanical type and quartz electronic type. Other types, such as transistor balance wheel, hairspring type, tuning fork type, etc., are rarely used. The desk alarm clock usually used on the desk is mainly used for travel, which is called travel alarm clock.
Having a good alarm clock is a good start to the day. Spring is the plan of the year, and morning is the time of the day. No matter when and where the alarm clock stick to its duty, not afraid of hard work. It's like a traffic policeman on his post. Even if it's windy and rainy, lightning and thunder will stick to their posts and serve the people. Just as the navigation lighthouse lights a bright light for every sailor.