Night lights, also known as advent lights and hurricane lamps, are a kind of illuminated device used in the dark. It can be activated by the presence of darkness or by manual operation. The main function of night lights is to provide a certain amount of illumination so that people can safely and orderly perform activities in the dark, such as reading, walking and so on. It can also stop people from inadvertently coming into contact with objects in the dark, and can aid in urgent firefighting and escapism. Night lights are usually equipped with devices such as batteries, solar panels or plug-in power supplies. They have many shapes and features, such as wall-mounted night lights, portable night lights, automatic night lights, and so on. Night lights also have decorative effects. They can bring out the atmosphere in the dark, add a bright color and make the environment more beautiful. Therefore, night lights are becoming the first choice of many people when they decorate. In summary, night lights are not only convenient for people in the dark, they can also play a decorative role, which is very popular.