MedWatch is a digital watch where “Watch” refers to “watch over”. If elderly persons living alone fail accidentally or lose consciousness at home, abnormalities may be detected by the sensor installed in the watch and help from the police will be sought. Besides, the door will be automatically unlocked which allows medical staff to enter smoothly so as to minimize rescue time and increase the chances of rescue. Apart from the lock, the buzzer installed on the door will be activated and the warning light will also be turned on in order to ask for help from neighbors.