you are right that you don't see them on older building but there are a range of other off the shelf products that can integrate with a smoke detector, phone, d

you are right that you don't see them on older building but there are a range of other off the shelf products that can integrate with a smoke detector, phone, doorbell to flash lights or lamp. condo/apt complex also only have to install fire alarm audio visual devices in the room under only certain conditions are met. I see no reason that anyone should rely on this app as a life safety device, it could be a last ditch effort when you travel to a friends home or something similar.