We may receive a commission on purchases made from links. Many front doors have two locking mechanisms — a deadbolt and a knob or level. There are now many smart deadbolts that allow you to use ...

Posts from this topic will be added to your daily email digest and your homepage feed. The $99 SwitchBot Lock is the first smart door lock I’ve tested that doesn’t replace any part of your existing ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Jon Chase Jon Chase is an editor of smart-home coverage. For Wirecutter, he ...

All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Gizmodo may earn an affiliate commission. Reading time 7 minutes ...

The main principle of this circuit is that the door lock opens only when the buttons in series are pressed at a time. We can use it to lock the doors and for other security purposes. This article ...