Headphones later. and microphone and 3-pin output. 4 poles are used when you need it: one for ground, one for the microphone, one for each speaker (left and right) = 4 poles. The output I wanted was a standard audio patch cord. with 3 poles, one for ground, one for each of the two speakers = 3. Some answers say yes, some say no. The 3-pin connector (or connector) is assumed to be compatible with devices that have a 4-pin input/output. No matter how compatible it should be, often the connectors do not mate properly and as a result you cannot reliably connect a stereo cassette adapter or other traditional (3-pin) audio device to a mobile phone or other 4-pin pole device. Device. You have to constantly play with the cable, pull it out a bit because a speaker is cut down, stuffed with noise, muffled, etc. 4 poles. It's just a 4-pin splitter. This is the standard connector that fits most mobile phones and each of the two connectors has 4 prongs. Two headsets can be connected to each of the two sockets. By "headset" I mean the one you use on your cellphone, ie with microphone, two speakers and ground (4-pin). While that's not what I wanted, I don't like the reviews. who complain about a product because it doesn't do what they want or because they ordered the wrong item, which often and incorrectly gets 1 star in a review. I could slam a bit with the confusing Q&A and other reviews being wrong etc but the product itself appears to be very well made and as such I give it an honest 5 stars. It seems to be a really high quality cable. it wasn't what I had hoped for.
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