def play_sound(self, subject="Find My iPhone Alert"):
        """Send a request to the device to play a sound.

        It's possible to pass a custom message by changing the `subject`.
        """
        data = json.dumps(
            {
                "device": self.content["id"],
                "subject": subject,
                "clientContext": {"fmly": True},
            }
        )
        self.session.post(self.sound_url, params=self.params, data=data)
Send a request to the device to play a sound.

        It's possible to pass a custom message by changing the `subject`.
        
pyicloud/services/findmyiphone.py