Metal & life detectorearphones

Earphones are used to listensongs when there is no work, they are pleased to hear. Metal Detectors are those instruments which can detect nearby metals and their quality. Life Detectors are those inventions which can detect the living things near its surrounding. Now a day a number of earphones are made which are totally designed for humans they are like ear bud, inside ear, behind ear, wireless, around the neck, above the head. The research is going on with respect to this problem, because of this many peoples lost their hearing capability. So that type of earphones should be made which can save lives and can also help human's ear so that it cannot lose its capability. Sensor earphones should be made to help humankind.