The Nest Hello Video Doorbell is currently the slimmest doorbell on the market. This smart doorbell has a slim profile and measures in at just 0.8 inches thick, making it one of the thinnest available options for mounting to your doorframe. It features an HD camera so that you can get a clear view of who's at your front door, as well as two-way audio so that you can communicate with visitors without having to open your door. Additionally, this particular model is compatible with both Amazon Alexa and Google Assistant, allowing you to control certain aspects of your home security system using voice commands.