我有时有时在我用汽车的辅助电缆时，它会显示第二个图标而不是第一个图标。它显示了我的第一个图标，无论是用内置麦克风还是没有麦克风的耳机 - 它是相同的图标。
My phone (LG G3) shows two different types of headphone icons. They are the leftmost icons in the images below. The first is a normal headphone icon. What is the second one?
I think it might be USB headphone, but that doesn't make sense, because I don't have USB headphones and never use USB headphones with the device.
I have noticed sometimes when I use the aux cable for my car, it displays the second icon instead of the first one. It shows the first icon whether I use headphones with a built-in mic or headphones that don't have a mic - it's the same icon.
Image 1: normal headphone icon
Image 2: ??
Edited images to make them smaller
Second one is showing a line out or auxiliary audio icon, which means that it had recognised that a jack had been plugged in ( but it doesn't detect a speaker or maybe it detects the speaker ) but fundamentally to differentiate between regular headset (with or without mic) and speaker connected with line out
If this happens when you connect to regular headphone, it indicates some dirt or pocket flint , preventing recognition of head phone. Cleaning with a tooth pick , ear bud and blowing air to dislodge muck should fix. If it doesn't, try app mentioned here What is this icon in my status bar?
Later versions of LG also differentiate between headphone with speaker and without speaker
I had this icon show up on a Dopod phone, owned a decade ago