Looking at CBE sockets I came across this
and this

CO detector makes sense but 'soporific gas' detector?????

I suppose if any gas pipes ruptures, you can leap into action and switch the gas bottle off.. before lighting the match to light the hob for a cuppa..

Ah, now that's where that newly purchased kettle comes in useful ............. hot water instantly on tap and there should be enough to provide those heroic Firemen - oops, Fire Persons - a nice cuppa after cooling down what remains of the van. And if Trumpton decide not to turn up.........well you can always throw the water on the flames yourself.

As anaesthetists have been unable to identify a soporific gas that can stay in a caravan long enough and in sufficient quantity to cause unconsciousness, you do wonder what gases the detectors are specced to find?

the only air borne I can think that would need a peg or really good ventilation, not an alarm, would be
tuna fed dogs the lasting gasping green reaction of the owner its really that bad, if your dog reacts
the odd cat bottom burp caused by vets prescribed biscuits

in all seriousness I wonder if this alarm is actually designed for people who sadly cannot smell anything?

I wouldn't call animal flatulence soporific!

These alarms seem to be designed actually to take advantage of gullible customers who have been conned into believing that there is a threat from anaesthetic gases!

Perhaps it is just a microphone listening for the Hisssssss of a gas,
ah! I see what you mean, too many likely triggers!

Carbon monoxide is such a gas but usually you don't wake up afterwards

Skip, it's mentioned earlier in the thread that they sell a CO detector, but they also sell a soporific gas detector, which is what we were discussing.

Mrs Eribanut is looking for a botty burp gas detector