The last thing you want to hear when you're using a machine is some kind of grinding noise. As you're reading that, you're probably envisioning the sound of a car engine turning and turning and not starting or a washing machine making a loud noise that you know can't be good. If you hear that grinding, you know something is wrong. The same goes for a smart door lock. Having to fit in a smart door lock where an existing deadbolt was can be tricky.
Source : https://www.pocket-lint.com/aqara-u50-smart-door-lock-review/
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