Anviz radio frequency proximity tag.
Automatic identification of the user by radio-frequency (RF), MIFARE. Passive tag, contains a chip that when approximated to the Ultraloq lock receives an induced current that activates it. When activated (electromagnetic induction) it returns a code to the system so requires no battery.
Communicates with the reader via an encrypted radio frequency to 13.56 MHz antenna, which allows for strict security to work with Ultraloq locks and not be copied.
Keyring format with plastic body and two metallic rings.