Ah, nice! When’re ya gonna take the cover off an’ give us a peek? 
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Looks like you’ve got a a Broan NuTone flushmount doorbell chime. Pop that cover off and you very likely have access to the internal wiring terminals. Should look like the photo I have attached below. Shouldn’t have to mess with any drywall or anything.
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Good find, and I appreciate the visual! My thinking was something like this, as well, that there should be relatively easy access to the terminals and adequate space inside the box for the Chime Controller.
Very helpful! I’m inching towards getting a blade and trying to get that panel to open up nicely/cleanly, now that I know the chime model and what I should expect to see inside.
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Btw, the chime controller I have is from the Video Doorbell v2. You’re saying it should theoretically work with the DCD.
Makes me wonder though… what about people who don’t have the v2? I didn’t see the chime controller being sold separately.
It’s not theory. Wyze actually recommends this. As far as separate sale of the Chime Controller is concerned, this appears to be via the app only at present time, though I’ve asked Wyze about this (but haven’t yet received an answer).
Alright, I opened it up and added the Chime Controller in the wiring path. So far, the DCD is working as expected. I’ll should know if it fixes the phantom chime in a day or so.
So far, it looks very promising!
Thanks to drum_buster37 and Crease for their help!
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@nathaniel.hang - After controller install, did you perform a doorbell button press to activate the chime? Did you set chime option in the app for mechanical/existing chime? Notifications in the app working on the phone? I may have missed your original post with settings in the app but assuming you had mechanical from your db.v2. Thanks.
I upgraded from the v2 to the DCD. I configured for “digital, 1 second” in built in house chime.
So far, everything is working as expected.
After installing the chime controller, the phantom dings and intermittent buzzes have stopped. I’m going to give it another day or so to confirm the fix.
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Thanks for taking the time to report back and share photos! 
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It might be worth noting the NuTone you have is a mechanical bell. I’m not sure if it will behave that differently if you select mechanical instead of digital. Can you try and let us know if you notice anything different there?
Interesting. It looks like a mechanical chime, but you set it up for “digital”?
It will be great to hear if that solves that issue for the long term!
Thought my eyes were failing me. Glad my first thought of “that’s a mechanical chime” was correct. The digital 1 second choice gives me another option if and when I install my duos.
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I had the same thought others have expressed, but I’d still expect it to work if set to digital because of Wyze’s recommendation in a troubleshooting guide. If it was my own doorbell, though, I’d probably set it to Mechanical in the app.
After a few days of testing, I’m happy to confirm that the installation of the Chime Controller (sourced from the Video Doorbell v2 package) appears to have “fixed” the phantom chime issue with the DCD.
Also, per everyone’s feedback, I’ve also set the chime setting to “mechanical” for the Broan-NuTone Flush Mount Doorbell that was installed by the builder. Although it doesn’t appear to have any notable impact on the functionality (whether setting it to digital/1 second vs. mechanical chime).
In any case, just wanted to thank everyone here for their help and feedback!
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That’s great! Thanks for reporting back.
If you’re feeling like doing an experiment, see what happens if you put the setting back to “digital” and pump it up to like 9 seconds, then go ring your doorbell and report what that sounds like. My hunch is that there will be some time between the “ding” and the “dong.” Whereas on the mechanical setting, or digital with a lower second setting, it will be a more natural “ding-dong” with no delay between the two notes. Some older analog doorbells if you held the button, the “dong” would not occur until button release - I think this is due to the nature of the actuator springing back to it’s resting state and striking the 2nd resonance plate/“bell.”
I think the digital option allows for a greater amount of time that voltage is supplied to the house chime unit when using the chime controller. Which is why they have that as a suggested alternate setting for mechanical chime
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I was starting to wonder about that! What you said makes a lot of sense and would explain why OP found it to work on both.
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The only difference I can tell is that “mechanical” is a more seamless “ding dong”, and digital has a “ding” then xx second long buzz sound; equivalent to holding the doorbell button down), followed by a “dong”.
So, other than the pause, there doesn’t appear to be any other functional difference between the chime settings.
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As I suspected. That buzz is your actuator / solenoid getting full prolonged voltage.
The buzz people hear without the chime controller is the same thing but lower voltage.
I have a lengthy post above that explains what’s happening here, your results are in line with my explanation.
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So there was a firmware release for the duo cam, but so far I cannot update mine yet.