Patent ID: 8112364

Claim:
An identification token wearable on the body of a user, comprising: a housing; transmitting means for transmitting user identification data to a proximity reader, said transmitting means located in or on said housing; state-switching means for switching the identification token between a first state in which said identification token is enabled to transmit said user identification data to the proximity reader and a second state in which said identification token is not enabled to transmit said user identification data to the proximity reader, said state switching means located in or on said housing; and sensor means for detecting removal of the housing from the user's body, said sensor means located in or on said housing; said state-switching means for switching, in response to said sensor means, the identification token from said first state to said second state in response to said housing being removed from the user's body; and said state-switching means for, in response to a signal received from an electronic device external to said identification token, switching said identification token from said second state to said first state if the identification token is re-attached to the user's body within a predetermined time after receiving the signal.