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Everyday life it is just a normal watch,when faced with a disaster emergency call can be initiated its devices.It becomes easy to be replaced by people calling for help and rescue of electronic products.Trapped workers because of water and food,has been difficult to adhere to for help.Therefore distress signal and lighting devices emit ultrasonic distress can increase the chances of people being discovered,thus improving the efficiency of trapped persons were found.
中国 陕西省 西安市 陕西科技大学（未央区）