The Nuki Fob is an extra extension to your Nuki Smart Lock. With this extra tag you open and close the smart lock with 1 push of a button (even without a smartphone). With 1 Fob you can open up to 100 smart Nuki locks. When opening the lock, make sure that you are not further than 5 meters from the lock otherwise there is a good chance that the mutual bluetooth connection will not be established. Press and hold the push button for about 5 seconds and the LED lights on the Fob will indicate that the lock opens automatically.