The Smoke/Co2 detector I have is just a sensor, you can’t make it do anything.
If you’re looking for something not as loud, I recommend the Aeon Labs Doorbell.
It comes with a button you could use as a panic button or something other than a doorbell and it allows you to store and play up to 100, 20 second mp3s so you can also make your house talk. The only downsides are that the doorbell has issues working as an actual doorbell, it’s not as loud as a siren, and if you’re using it as a siren it will only sound for 20 seconds.
I recommend using this device handler with it: