Make sure you have the right transformer for your video doorbell
(Android Central)

You need a 30VA transformer so your new video doorbell will work properly, and the one in your house right now might not be strong enough. Of the many great deals coming up for Black Friday, a smart video doorbell is bound to be on sale. As someone who has one, let me tell you, it`s pretty awesome. Seeing who is at the front door can be pretty handy, especially when you`re not at home to peek out of the curtains and have a look. But the fun will be short-lived if you don`t have an existing door chime transformer strong enough to power the thing. Even if you already have a doorbell, your transformer might not provide enough power. There`s a good chance you have a chime transformer in your house already, especially if you currently have a doorbell. It`s a small metal electrical device that converts your house voltage to the low-voltage a doorbell chime needs, and you wouldn`t even know it was there unless you needed to replace it. Since most door chimes don`t need much current, ...