Does anyone know where to find the meaning of the various google icons that can appear in the headset screens? I am getting an alternating P2 battery (ok)display with an icon that looks like a plug on a 110v cord. Not sure what that means. My P2 onboard lights show full battery. Maybe the alternate icon is displaying a low battery charge on the googles themselves. Anyway, I wish I knew what the various icons are and they are not explained in the manual that I have. Thx.