At $149.99, the Aqara U50 is officially the least expensive Apple Home Key smart lock around, taking over the entry-level place of the U100. Not only can the U50 be operated via voice commands, passwords, key cards and the mere tap of an iPhone or smartwatch, it can also be re-keyed to work with your existing keys, unlike the U100. However the conspicuous lack of a fingerprint reader might create a dilemma for homeowners considering the U50.