Abstract: A personal security apparatus includes an electronic device that includes a housing having a front wall, a rear wall, and a side wall extending between peripheral edges of the front wall and the rear wall, respectively, the housing defining an interior area. A whistle assembly operably situated on the housing that includes a slit defined by the front wall of the housing, the slit being displaced from and proximate to the side wall of the housing. The personal security apparatus includes a battery positioned in the interior area of the housing and an audible alarm electrically connected to the battery. An input member, such as a panic button, is positioned on one of the front wall or the rear wall of the housing and electrically connected to the audible alarm for energizing the audio alarm when actuated.

Abstract: A personal security apparatus includes an electronic device that includes a housing having a front wall, a rear wall, and a side wall extending between peripheral edges of the front wall and the rear wall, respectively, the housing defining an interior area. A whistle assembly operably situated on the housing that includes a slit defined by the front wall of the housing, the slit being displaced from and proximate to the side wall of the housing. The personal security apparatus includes a battery positioned in the interior area of the housing and an audible alarm electrically connected to the battery. An input member, such as a panic button, is positioned on one of the front wall or the rear wall of the housing and electrically connected to the audible alarm for energizing the audio alarm when actuated.

Abstract: Acoustic transmitting antennas in the form of circular rings. Several circular rings which can be dismantled of a known type are superimposed in a stack. The stack is terminated at each end by two profiled annuli. The threaded tie-rods traverse the stacks of the pre-stressing keys of the rings by the intermediary of holes drilled in these keys. The threaded tie-rods make it possible to ensure the holding of the assembly. Two jackets, inside and outside, made of rubber, cover the inside and outside faces of the stack and are anchored in grooves formed in the profiled annuli. Thereby, annular transmitting antennas can be provided which can be dismantled entirely and whose active mass to inactive mass ratio is particularly large.