One of the awesome deals on Amazon Prime Day is a Ring Video Doorbell Pro and 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 for a Ring Pro.

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, it's fairly common to find 8V or 16V / 15-20VA (volt-amps, a unit of power in an electrical circuit) transformers used for them especially in homes more than 20 years old.

It's also the first thing you should look at if your new Ring Pro doesn't "act right". Your current transformer could be enough for things to turn on and initially connect to Wi-Fi, but once you try to connect video or even send data through the app or your virtual assistant, things might get a little squirrely and the whole works will lock up. As your Ring Pro does more things, it needs more power and a low power transformer can't provide it.

Here's where we need to mention that you need to be safe. Finding and changing a door chime transformer isn't hard but it is connected to your house's 110-volt power and can be potentially harmful. Unless you know what you're doing or have confidence you can do it yourself, call an electrician.

If you suspect your transformer isn't powerful enough, first you need to find it. Look around the chime itself for a blank cover over an electrical box first, then move to the chime itself or your electrical panel if you don't see anything. Since one side of the transformer is connected to over 100 volts, it shouldn't be just laying around anywhere but I have seen them mounted inside an electrical box in the attic or basement.

Finding the transformer is harder than changing, but call an electrician unless you know what you're doing.

Once you find it, make sure the power is off and look at the top of the transformer itself. You'll find a sticker or some engraving that tells you the voltage and power in VA that it's rated for. You'll need a transformer rated at 16-24 VAC and 30 VA to power things properly. If that's not what you have, you need to change it.

These parts aren't hard to find and as long as they are properly rated every one of them will work. Amazon is a great place to pick one up on the cheap, just get one that mounts the same way your existing one does and you'll be set up in no time.

Our Pick

Craftmade Chime Transformer

Gold Standard

Craftmade is known for making high-quality electrical parts and components and this chime transformer is one of the best you can buy even if its a little more expensive.

Also Great

NuTone Doorbell Transformer

Easy Installation

This transformer is easy to install, either to an interior wall or into a junction box lock mount. It will provide just what your Ring Pro needs, too.

You'll also want the doorbell itself

Ring Video Doorbell Pro ($169 at Amazon)

There's so much to like about this compact, easy-to-use video doorbell, especially if you're already into the Ring ecosystem. Answer the door from anywhere and work with other Ring products to unlock your door and more.

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