Abstract: A personal security device comprises a housing which encloses a battery and an electrically energized signal device such as one or both a buzzer or lamp in series in a normally open circuit. A clip supports the housing on the body of the user and incorporates means for automatically closing the circuit whenever the clip is removed from the body to produce the desired audible or visible signal or both. The housing is shaped so as to maximize opportunity for the sound to be heard or light signal to be seen when the security device is thrown to the ground in an emergency.