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I tested a palm recognition lock that doubles as a video doorbell - and it's stylish and smart

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ZDNET's key takeaways The Eufy FamiLock S3 Max is a new video smart lock available for $400.

This smart lock also features a camera and doorbell button, and an indoor screen shows you who is at the door.

I just wish the FamiLock S3 Max could unlock with human recognition using the Eufy HomeBase BionicMind, and the smart lock isn't convenient for some users, like those with a screen or storm door. $399.99 at Amazon

That viral phrase, 'I don't have a favorite kid, but there is one we try really hard not to annoy,' perfectly fits my rowdy three-year-old. She's unabashedly commandeering yet sweet, always getting away with mischief. She's tossed our car keys in the trash can and now runs to bust open the front door and welcome visitors whenever she hears the doorbell ring (sorry, UPS guy).

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We discipline her plenty, but we know we're the biggest culprits for her brazenness, being the baby of the family. Giving her control over small things helps her stay confident without tipping into chaos. I taught her how to talk to Alexa to control music and lights and, more recently, how to peer into the front door camera with the Eufy FamiLock S3 Max, which has proven quite effective.

The Eufy Security FamiLock S3 Max was designed to be a family-friendly smart lock, hence the FamiLock branding. This lock uses palm-vein recognition for unlocking, a biometric scanning technology that is more accurate than fingerprint scans, passcodes, app unlocking, and a physical key.

Also: I tested a smart lock with facial recognition, and it spoiled every other one for me

On the inside, the smart lock features a display that shows what is happening outside your door in real time. This is perfect for kids, visitors, and other family members who may not have access to the Eufy app to see motion alerts.

When the doorbell rings now, my kids run to the front door and look at the display instead of my three-year-old running to swing the front door open (yes, I already bought an extra child-proof lock). Now, she looks at the lock's display to satisfy her curiosity and runs to tell us whether the 'box truck guy' has a box.

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