S5 enables device-to-device communication. This advanced feature allows a vast amount of data to be remotely updated and then shared between readers, keys and locks in a building. Data is updated every time a door is opened. Information, such as access rights, time limitations, lists of blocked keys and audit trails, is quickly shared between the devices before the door is unlocked. With all devices connected and communicating with each other, S5 keeps access rights information continually up to date.