Both Yale Approach Lock with Wi-Fi and Keypad and Yale Assure Lock 2 offer signature smart features like Auto-Unlock and Auto-Lock, but there's a big difference: how they attach to your door. Yale Assure Lock 2 replaces your entire deadbolt during installation while Yale Approach Lock with Wi-Fi only replaces your thumb turn, which lets you keep your keyway and makes it renter-friendly. Yale Approach Lock also installs on the interior side of your door, while Yale Assure Lock 2 attaches to both