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Out of the box, the lock works using Bluetooth LE. It’s bigger than what was there before, but isn’t overwhelming. On the inside of the door, there’s now a small box attached to the door with a manual deadbolt control (i.e., you turn it and the lock slides open or closed) at the bottom. Gone was the old traditional key lock above my door latch on the outside instead, there’s now a black glass keypad. The smart lock has more lock hardware, but it’s not ridiculously large. I did the replacement in less than half an hour, using nothing more than a screwdriver. (It’s also the current Wirecutter pick.) It was an easy swap-out replacement for my existing deadbolt. The lock I bought is the $300 Yale Assure SL YRD256, which works with HomeKit and other smart-home tech via the bundled Connected by August module and gateway. That backstop saved us from a lot of second-guessing.) (Our previous door had a deadbolt and a knob that you could set to lock when closed. My front door has a deadbolt and a separate door latch-one that doesn’t lock, which means every time we’ve come and gone since we got the door six years ago, we’ve had to manually lock the deadbolt. By the time we got home, I’d ordered one. I’d been skeptical about replacing our front-door deadbolt with an Internet-connected gadget since I’d first heard of the Smart Lock category a few years ago, but in that moment I saw the perfect use case. The moment we were headed down the freeway toward the Golden Gate Bridge and began to wonder if we’d remembered to lock our front door, I resolved to buy a Smart Lock. This house is accessed by keypad (or iPhone) now. Yale Assure SL review, or: How I learned to stop worrying and embrace the Smart Lock