One ring to unlock the door.
There are rings and then there is the NFC Ring Ceramic Eclipse Smart Ring. This amazing bit of jewelry can be used to unlock doors and phones or used to transfer information and link people. Program it to suit your needs using the NFC tag inlays sealed inside the ring. It’s water resistant and there’s no charging required. You’ll feel like you can perform magic, just don’t go trying to break into a bank or anything.