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To designed an alarm clock which can be worn on the hand,just like a watch.The main feature is that the watch can be connected with the Bluetooth interface.Because modern people are using cell phones to set several alarm,over-reliance on cell phones.But the phone on the bed next to the human is really bad for our body.Electromagnetic make people immune function decline,reducing the body’s calcium and lead to abnormal production,abortion,visual barriers to cell division,such as cancer,leukemia…and so on.Therefore,the main purpose of this design is that people can have a healthy sleep,letting the phone away from your own peace for charging.