GreatCall splash, Руководство пользователя

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By design, there is no volume control. If you are in a location
where the device’s sounds may be disruptive, you may want to
turn off your device. Make sure to turn it back on afterward so
that it is ready for any unsafe situation you may encounter. If you
are in a noisy area, you may need to move the device closer to
your ear or to your mouth.
NOTE