Excellent smart device comes with optional 24/7 video recording with facial recognition – and works as a doorbell too Google’s new Nest Hello is a video doorbell that aims to be smarter than the rest with constant recording, face and object recognition.The Hello is a direct replacement for a wired doorbell, working with an existing chime and requiring constant power, making it one of the high-end options for smart doorbells.The Nest app runs you through full installation instructions that you can’t skip, even if you’ve had an electrician install the doorbell for you. Tedious