I cannot hear Fire alarms because of their high frequency.Can one get low frequency sound alerts?

I've never seen LF alarms but one's with strobe lights are available.
 
the SpectraAlert P2P would be good for you too!
they look like this and I have those in my condo (my mom can only hear the LF but not the high frequency like I do. (she may not hear certain high tones)
p2rh-lf-right-hires_11354469.jpg
 
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