An integrated protective accessory for a helmet comprising: a protective element for rigidly attaching to an external shell of the helmet via one or more fasteners; The protective element includes an impact detection device integrated with the protective element via one or more device fasteners such that a portion of the protective element has a compatible fastening element to that of the one or more device fasteners so that the impact detection device is rigidly attached to the protective element, the impact detection device having: a housing; one or more sensors within the housing for sensing an impact event of a wearer when wearing the helmet and for producing sensor data; an alarm element coupled to the housing such that an alarm condition produced by the alarm element is detectable by one or more persons near the wearer; and a processor within the housing for processing the sensor data against an impact threshold and for producing an alarm condition signal for expression by the alarm element as the alarm condition. One or the sensors can be a gyroscope for measuring rotational aspects of G forces from the impacts forces.