defines sound chamber vents 125 the top end measures approximately 20 5 inches in height e g along dimension 106 as was stated the bottom section is of relatively identical construction having a fourth dimension along axis 107 of approximately 52 millimeters and a dimension along axis 114 of approximately 41 millimeters the bottom section 103 further defines holes 121 and 122 as well as defining holes 126 it will be seen that the device is powered by a set of batteries these batteries are held in a battery chamber within mid section 104 which is covered with battery cover 134 battery cover 134 is designed to be relatively difficult to remove without the assistance of some tool such as a screwdriver blade or a coin the tool may be inserted in slot 135 in order to remove the cover for example to change the batteries however it should be difficult if not impossible to remove the batteries without assistance of some type of a tool this leads to the advantage of preventing easy removal of the batteries and thus disabling of the device by an attacker the device 101 further includes a clip 131 along its mid section 103 which may be used to attach the device 101 to for example a belt worn by the user or to the carrying strap of a.