This is a plastic tag with an NFC chip. By holding the registered tag up to the device, you can unlock Sesame Touch and Touch Pro. Using it with Sesame Touch and Touch is recommended. No time lag like: Smartphone Bluetooth communication Sesame Touch fingerprint authentication Sesame Touch Pro PIN code You won't feel the time lag like with a remote. Editable and writable with an editing app. SESAME4 SESAME5 Smart Key