int: The speaker's volume.

        An integer between 0 and 100.

def volume(self):
        """int: The speaker's volume.

        An integer between 0 and 100.
        """

        response = self.renderingControl.GetVolume([
            ('InstanceID', 0),
            ('Channel', 'Master'),
        ])
        volume = response['CurrentVolume']
        return int(volume)