Abstract: To provide a novel electrical personnel security system in which a battery is open circuited until ready for use and then energized while permitting a casing to remain sealed; a case for a transmitter supports a circuit board having a battery opening in it. The battery is supported within this opening by positive and negative battery contacts which are conductive springs that hold the battery between them and exert force against them. One of the battery contacts is in direct electrical contact with the battery while the other is separated by a spacer member aligned with a guideway to prevent closing of the circuit as long as the spacer member is in place between the contact and the battery. The casing includes an aperture for the insertion of a pin that results in removing the spacer by moving it along the guideway without tilting the circuit board. The aperture may be sealed by a plug against water.