Today I purchased Sennheiser headset MM 70i for iPad. It works flawlessly
with iPad, no problem at all.
The normal 3.5 headphone will have 2 black round rings, one for left
channel, one for right channel.
The normal 3.5 headset will have 3 black round rings, one for left channel,
one for right channel and the third one for mic.

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