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I have this carbon monoxide alarm, ussually bring it when I camp in my lavvu tent jorden have a small campfire because I keep that running all night while winter camping, and as much as peacefully asphyxiating in your sleep sounds, I would rather go home
Reason I would call it a multitool is that its also a surprisingly accurate thermometer, draws veeeery litle power from the 4 AA' In it, so it's always a battery backup
It's light, has held up to sub zero temps, a little bulky, but smaller then a sunglasses case
And, I can hit the "test" button in the night to prank my friends