Abstract
The proposed sleep security and energy-saving device with heart rate as the turning point of body, provides a solution for some of the problems existing in the modern family life. Such as electrical appliances may waste too much electricity, or bring safe hidden trouble. The device is originated from the medical phenomenon which is when the body is sleeping. Human heart rate will slow down to a certain extent than normal. If the heart rate has difference with the normal levels in a period of time, the device will make a judgment that disconnects the electrical appliances.
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