This tiny smart lock promises to unlock your door in under two seconds

Nuki says its new Smart Lock Ultra is a third the size and three times as fast as previous models. | Image: Nuki Popular European smart lock maker Nuki has announced the fifth generation of its smart lock. The Smart Lock Ultra is a third the size of the original Nuki, features a new brushless motor for faster operation, and promises at least six months of battery life. Plus, for the first time, the new lock has been designed to work with US deadbolts.The Nuki Smart Lock Ultra (€349) will be