In accordance with some embodiments, an apparatus includes: a support structure; a storage circuit mounted in or on the support structure, the storage circuit for storing data; an antenna mounted in or on the support structure and coupled to the storage circuit for selectively transmitting the data; a switch mounted in or on the support structure, the switch being for initiating a time period in which the apparatus is enabled; and a timing circuit mounted in or on the support structure, the timing circuit being responsive to the switch for setting an end point to the time period; wherein the apparatus is operative to perform data exchange with a reader via the antenna only during the time period. In accordance with some embodiments, a method of operating an identification token includes detecting actuation of a switch on the identification token; in response to the detected actuation of the switch: enabling the identification token; and initiating a time period; determining an end point of the time period; and disabling the identification token if the end point of the time period is reached.