How about the one with the little microphone icon beside it?
Only you can know - by reading the manual or checking on the manufacturer's
website - there is no definitive standard
vvvvvvvvvvvvvvvvvvvvv
When all else fails - RTFM!
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Red.. or was it the blue,, was a dark blue.. maybe even a black blue.. wait
up, I will look at my own.. no, sorry, can't help you,, mine is plugged into
the pink one, but you don't have a pink one..