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Use the iPhone to Detect if Someone is At Your Door

One of the iPhone’s most helpful features is Sound Recognition. When you activate it, your iPhone will listen continuously for certain sounds – such as a knock at the door, water running, or a dog barking – and notify you when it hears it.

Here’s how to activate it:

Go to Settings > Accessibility and then select Sound Recognition.

Toggle Sound Recognition to on.

Tap Sounds, and then choose the sounds that you want your iPhone to recognize.

You’ll see a handful of preset sound options, like a Dog Bark, Door Knock, Water Running, and more.

Select the sound you’d like your phone to recognize and toggle it to on. We’d also recommend setting a different custom alert tone for each sound you choose.

From there, test it out. You will hear a sound and notification when the sound you’ve chosen has been detected.

Note that Apple indicates that this feature is not 100% accurate, and shouldn’t be relied upon in emergency situations.