A radio frequency identification (RFID) card having an antenna configured to transmit data wirelessly to a remote receiver and an integrated circuit configured to transmit the data through the antenna to the remote receiver. The integrated circuit includes a transmitter section and a memory section. The memory section is configured to store the data. A power generating device is configured to supply power to the integrated circuit and a light-sensitive switch is interposed between one or more portions of the RFID card. The light-sensitive switch is configured to provide electrical coupling between the one or more portions of the RFID card when light is incident on the switch.