At the very least, they might advise to whom you could entrust an emergency key…
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Having read through the comments – no one mentions regularly testing their alarms. As a retired fire officer, when giving fire safety advice, I used to recommend regular testing, at least once a month, preferably weekly. Takes a few seconds, but could save your life.
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Ours gets tested almost every day just when dinner is ready 
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Fair comment…
Ours blinks silently every now and then… to show all is well… 
Both mine blink regularly as well.
As far as I know they all do.
When the batteries are running low in the Alarms fitted to the local council houses… they start moaning/squeaking… every now and again… until the batteries are changed.
I know, 'cos I’ve heard them
Ours has never muttered a word, merely blinked at me… silently… until it obviously decided “'now’s the time, I want new batteries, please…” and it went berserk…
(Incidentally, when a tenancy changes, new batteries are always fitted .)
For some reason they always decide they want batteries in the middle of the night.
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I buy ones with 10y batteries so I can live with 1 interupted sleep. Also its time to change the units then.
I have read a that there are a few doubts over them.
Potential problems surrounding 10-Year Fire Alarms with Sealed Batteries https://www.cga.ct.gov/2015/psdata/tmy/2015SB-01012-R000303-Energizer%20Duracell-TMY.PDF
Well, our Alarm takes 3 standard batteries so we had replacements readily to hand… the old lot lasted 8 years… so no complaints.
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Yes understood, doesnt forgo the neccessity to actually carry out a regular test, our last ones still beeped as the battery was failing.