Otto Smart Lock

The same diameter as a standard deadbolt — 2.6 inches — the Otto Smart Lock is one of the smallest connected locks you can buy. It automatically detects your arrival, letting you open your door with a single press, and also gives you the options of turning its outer ring to enter a four-digit entry code or unlocking via an app over Wifi. Its standard size means it's compatible with most doors, and it comes in silver, gold, or black to match most decors.

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