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Night Light is needed by everyone, however it is likely to cause a waste of electricity. People usually use nightlights in a short time before falling asleep, but it often lights up all night.
Playing ball is designed for childern, it takes the image of a kind of child toy and kitten playing wool balls. The use of toy is pulling ring to make it sounds, and will play as line gradually shorten after releasing ring. Finally, music will stop until line to a minimum. Playing ball replaces music to light, makes it more easy to use for children.
National Kaohsiung Normal University