Use a portable battery.
Connect it with the breathingmask via micro-usb.
Put the breathing-mask on your face.
Make a wifi-hotspot on your phone
Name it: Accessphone , with the same as password: Accessphone
You will be connected with a mqttt-server.
There, all frequencies are gathered and used to produce sirena-sounds,
converted by different oscillators.
Breathing-Sirenas can share all sirenas breathing in the world.