Connected security cameras are one of the first smart home devices people think about buying, yet it's understandable that not everyone feels comfortable with a camera inside their house recording their personal life. That's why video doorbells make a lot more sense — they provide the benefit of a security cam aimed at your home's entrance, while also offering several other perks like checking deliveries or answering the door when you're not home. But not everyone has the luxury to install one of them: if you can't mess with the wiring of your existing doorbell, you've probably skipped the product category entirely.