Smart doorbells have been around for a while. They let you watch your door on your phone. The Ring Video Doorbell 3 Plus is upgraded to better serve you. It lets you see, hear, and speak to anyone from your phone, tablet, or PC. It comes with improved motion detection, privacy zones, and dual-band (2.4 or 5.0 GHz) WiFi connectivity.
Ring has 1080p video resolution, night vision, and 160/84-degree horizontal/vertical field of view. You can connect the device to your phone to review what you have missed. Ring plays well with Amazon Alexa too.[where to get it]