August made retrofit locking mainstream in 2013 and has been part of ASSA ABLOY since 2017. The mechanism clamps onto the inside of a standard single cylinder deadbolt, so the outside of the door does not change and every existing key still works, which is why the brand is popular with tenants. The fourth generation Wi-Fi Smart Lock is noticeably smaller than earlier discs and connects without a separate bridge; DoorSense tells the app whether the door is actually shut, not merely locked.
A good fit for a rented flat, a shared entrance or anyone who dislikes drilling. Less suitable if you want a keypad on the door itself, because that is a separate accessory, and it will not help on mortise or multipoint European doors. Battery life depends heavily on how often auto-unlock triggers.
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