Ultion Nuki incorporates the 3-star plus Ultion cylinder and bears a £2000 security guarantee. No security standard is known to man or beast that this locking mechanism has not passed with flying colours. All transmissions with Ultion Nuki lock are safeguarded with state-of-the-art end-to-end encryption typically used in online banking. It is also regularly examined and certified by independent security institutes. Consequently, the Nuki Smart Lock reaches the highest AV-TEST available (level 3).