It releases your doorbell from the back plate!
Wyze Duo Cam Doorbell comes with some very important parts, but there's only one that you'll use as much as the rechargeable battery: the Doorbell Detaching Pin. Don't lose it!
This tiny pin goes in pinhole at the top of your doorbell, which you must do to release the doorbell from the back plate. You'll use it during installation and whenever you need to charge or replace the battery pack.
It is also a handy security feature - you need the pin to release the doorbell.
It's the fix for a common mistake when mounting the doorbell!
When installing your Wyze Duo Cam Doorbell to the back plate, you must attach the bottom first, then the top. Like this:
If you accidentally attach from the top first, you will not be able to secure the doorbell to the back plate. It will not connect to the bottom. You must use the Doorbell Detaching Pin to release it, then try again.