Am I being stupid? I cannot seem to find this info anywhere (I am extremely tired this morning so no patronising replies please if someone finds it straight away
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I would like to know the decibel level of the alarm as we are wondering if my DCs who are deaf (profound/severe) would hear it. I'm also slightly worried that my DC who has their phone connected to their aids 99% of the time by Bluetooth will be, well "deafened" by the noise isn't the right word is it? 

I know phones will vibrate but obviously that's no use unless they are in their hand which they are 99% of the time once again