A device and system are described that include an authentication device having a battery, at least one battery contact, an antenna, at least one antenna contact, a ferrite material barrier, a diode electrically coupled to a battery contact and an antenna contact, and an authenticator coupled to the diode, a battery contact, and an antenna contact. A system includes the device with an authentication device, a transceiver electrically coupled to a near field communication contact, a switch electrically coupled to the transceiver and an antenna contact, and a communication system electrically coupled to the switch.