A wearable device to effect access control comprising: a processor component ; a storage accessible to the processor component to store an access credential; a presentation component of the processor component configured to retrieve the access credential from the storage and to send the access credential to an access device to enable a grant of access to a secured item ; a power source ; a clasp coupled to a wearable portion to prevent removal of the wearable portion unless the clasp is operated to change state from a clasped state to an unclasped state, the clasp causing loss of electric power from the power source to the processor component and to the storage when in the unclasped state to nullify the access credential; characterized in that the wearable device further comprises: a transistor to cooperate with the power source and the clasp to provide a residual amount of electric power to the processor component and the storage for a relatively short period of time after the clasp is operated to change state from the clasped state to the unclasped state; and a status component of the processor component configured to monitor the state of the clasp and to use the residual amount of electric power to nullify the access credential by altering at least a portion of the access credential within the storage during the relatively short period of time. a processor component ; a storage accessible to the processor component to store an access credential; a presentation component of the processor component configured to retrieve the access credential from the storage and to send the access credential to an access device to enable a grant of access to a secured item ; a power source ; a clasp coupled to a wearable portion to prevent removal of the wearable portion unless the clasp is operated to change state from a clasped state to an unclasped state, the clasp causing loss of electric power from the power source to the processor component and to the storage when in the unclasped state to nullify the access credential; characterized in that the wearable device further comprises: a transistor to cooperate with the power source and the clasp to provide a residual amount of electric power to the processor component and the storage for a relatively short period of time after the clasp is operated to change state from the clasped state to the unclasped state; and a status component of the processor component configured to monitor the state of the clasp and to use the residual amount of electric power to nullify the access credential by altering at least a portion of the access credential within the storage during the relatively short period of time. a transistor to cooperate with the power source and the clasp to provide a residual amount of electric power to the processor component and the storage for a relatively short period of time after the clasp is operated to change state from the clasped state to the unclasped state; and a status component of the processor component configured to monitor the state of the clasp and to use the residual amount of electric power to nullify the access credential by altering at least a portion of the access credential within the storage during the relatively short period of time. <EOS>