Update to Review, set to one star, May 2, 2023.I bought this in late DEC 2022, and it was delivered Jan 6, 2023. In late April, the device image went grainy. I've uploaded a picture. This can't be fixed with any sort of reset. I've contacted Google via phone and email, and logged a support case, and the response I get is:"We have already filed a request for the process of the replacement on your device and it shows here that Google does not provide a commercial warranty with your purchase. Please contact your original point of purchase to determine if a commercial warranty was provided with your purchase."On the Amazon product page for this Nest Doorbell, it indicates this:"Product Warranty: For warranty information about this product, please click here" .. and click through goes to a bare page on which it reads: "Please contact the seller directly for warranty information for this product. You may also be able to find warranty information on the manufacturer’s website."Great -- I'm in an infinite loop and neither side will help. So, two take-aways: • you're on your own after the Amazon return period (~1 month) • this is a low quality productAVOID!*********************************************Original Review, FEB 2023.I bought this to replace my SkyBell, which died after a network configuration change.I did the install for this myself, and it was troublesome. First, the doorbell indicated that the power voltage was insufficient. However it still worked to activate the existing mechanical chime doorbell inside. However it stuck the bell knockers (like tapping and holding, it muted the sound). I had to adjust the Chime Duration settings.Once I was through that, after some online research (I wasn't going to pay several hundred dollars for a "Nest Home Pro"), I researched more about the voltage problem. The voltage from my doorbell was insufficient - I think it was ~10V, and, for the Nest Doorbell (Wired), it MUST be 16-24 V AC, 10-40 VA. These specifications are really important. At that point I got up in the attic and followed my doorbell wire back to the garage where I found the hard-wired transformer near my garage door. I reviewed its type, then went to Home Depot and bought a 20V Hampton Bay Wired Doorbell Transformer, for about $25, returned home, popped the breaker for the doorbell, checked there was no current, and upgraded my transformer.After that, the unit started up and I was able to complete the app-based installation process.This unit has an included SD card in it, and it's not necessary to get a subscription to use it, which was one of the main features I was looking for. I already have home cameras that record, so it saving the last few hours of photos is good enough.Video and audio quality is very good, and so is the night vision. It's possible to do two-way audio communication.The only other problem I have is that when I connect to it from my phone from within the house, sometimes it doesn't connect, but when I disable wifi on my phone and connect via cell, it works fine. (I had the same problem with my old doorbell).