RFID locks feature a simple operational design. They primarily use cards as tags that help to send signals at a particular frequency to the tag/card reader. A chip embedded underneath the lock allows the transmission to happen. The card reader on the door dissects the signal and prompts the lock to open. Once opened, the door can be released and as soon as it is shut, the lock will automatically latch. For the system to work, the card has to be in close proximity to the card reader on the door lock.