I brought the white one too. I can hear the high pitch sound and we also got bite! I am using it just to hope it can help, but I know it is definitely can't get rid of all mostiques.
I also use a machine which has Ultra Violet light for killing mostique, I have been using it for a week, but not sure is it working or not. because I have never seen a mostique got killed by it. But seem like I don't get bite these few days. Let me try for longer and tell you.