The Philips Smart Deadbolt with Built-In Wi-Fi fits over most existing hardware, is surprisingly affordable, and can be controlled remotely via a mobile app.
The Yale Approach Lock has the potential to be a great retrofit smart lock, but some performance issues limit its ability to provide true peace of mind.
The Yale Keypad Touch lets you control your front door with your fingerprints. It's compatible with the Approach Lock, as well as several August smart locks.
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