The cylinder is not included in the scope of delivery, it must already be installed. It is therefore not possible to say how secure the cylinder is. If you mean the Nuki in general, opinions differ. Secure enough for my taste. If I had the MonaLisa hanging on my door, I would probably invest more money in security than a Nuki.

The Nuki is mounted on the inside of the door. So the burglar has to break in first... What is easy to take with you, however, is the keypad. It is mounted outside so that the code or finger scan can be made. But it can also be hidden. Should be in Bluetooth proximity to the lock.