a multi - part closure provides remote indication of a secured or unsecured state of the closure . the closure includes first and second mating members that when engaged define a secured state and when disengaged define an unsecured state . a self - contained transmitter is disposed in the first member . a switch is disposed in the first member in electrical communication with the transmitter . the switch is positioned within the first member for engagement by the second member when the first and second members are mated with and secured to one another . a remote receiver provides indication of the engage or disengaged state of the first and second members .