Below is a recording of the sounds I believe the cameras are supposed to detect, provided by the Wyze Devs. I believe the first half of the recording is a smoke alarm, and the second half is a CO alarm. I believe they are based on a 2014 update to NFPA 72, the US National Fire Alarm and Signaling Code. So you will probably need a US smoke detector less than a handful of years old.
I have 2 cameras within a ‘room or so’ of my computer and my smoke detector, which is on the hallway ceiling just outside my computer room. I tried playing the recording of both sounds from my computer (which has a high fidelity speaker bar) and using the ‘test’ button on my smoke detector. My results were mixed.
To start, they appeared to alternate between detections. First one would detect the smoke alarm sound, then the other would. About the 5th time they both detected the smoke alarm sound together.
So I moved a third camera into the same room as the computer, and played the recording. It correctly identified both sounds right away. One of the other two cameras also picked up on the smoke alarm sound.
Then I pressed the test button on the smoke alarm, and all 3 identified it. Remember, this was spotty when I only had two cameras, so I assume I just got lucky.
They did all say “Smoke [or CO] alarm sound detected” each time. Sound alerts were off, only had smoke and CO alerts on, w/sound detection setting @ 100%.
At no time did either of the cameras outside my computer room report the CO alarm sound playing from the computer, however (and it was very loud!)
So maybe all the wall ricochets created an echo chamber and distorted the sound at the other two cameras? Unfortunately that would mean the camera and smoke/CO detector would need to be pretty close to the camera.
But the one in the room with the recording always correctly identified both sounds.
Here are the sounds: