StarTech.com 2m 3.5mm 4 Position TRRS Headset Extension Cable - M/F - audio Extension Cable for iPhone (MUHSMF2M)

I needed to extend the cable on my dual screen portable dvd player screens. I wanted to run the cables along the floor rather than suspend them between the two front bucket seats of my fullsize van. The cable arrived in excellent condition very quickly shipped. Only issue is the sleeve portion of the connector was too short for my application (Sylvania SDVD9957 dual screen portable dvd player). (FYI TRRS = Tip, Ring, Ring, Sleeve) The connector for my player has a longer sleeve to allow it to connect through the thick plastic housing of the unit. The rest of the connector (tip, ring, ring) on this cable is identical to my original cable. I tried like crazy to find a 3.5mm TRRS extension cable with a longer sleeve on the connector. I finally gave up and started boring out the hole the connector goes into on my second screen (plastic housing). This got me 75% of the way there and the rest was achieved by grinding down the shoulder of the sleeve on the cable. Frankenstein, I know, but it works. The connector is buried in the housing of the screen. So, my lovely grinding job is hidden from the untrained eye. The male connector of the original cable doesn't completely insert into the female end of this extension cable, but the contacts all line up and the connection holds firmly together.Moral of the story: Look at your existing cable to see if all four contact points are of equal length. If they are, this cable should work great for you. If not, be prepared to get the Dremel tool out, or go crazy looking for the right cable.

Here's the story...I have an iPhone in an Otterbox Defender case. I also use Intuit's goPayment service, with a credit card swiper. The problem I had was that the card reader does not plug all the way into the iPhone while it's inside the phone case.Intuit's solution was to "just remove the case every time you want to swipe a credit card". I think not!So after much research, I located a cable here on Amazon (and several other audio-related web sites) for $21. The comments stated it would definitely solve my problem.I was about to order the $21 cable when, for some reason, I located this one. Looking at the description, it looked like it should also work (but for $17 less!) The key is that the cable needs all 4 conductors running through it, with no wire reversals. (A plain "TRRS" cable).I chanced it and tried it. At first I was disappointed when the software told me it could not sense the card reader. Then I remembered that the volume has to be turned up all the way. Tried it again and, sure 'nough, when I scanned my credit card, my name and card number popped up on the screen. Works just fine!This cable saves $17 over the other one and the quality appears to be good. This is a 3' cable. You plug the male end into the iPhone, and the card reader into the other of the cable.Bottom line is that this is definitely compatible with an iPhone (mine is the 4s) and an Intuit goPayment card reader (in my case the white one).

EDIT: It is important to plug your headphones, mic, etc. into the cable FIRST and then the extension cable into your devise for it to work correctly. This does not fit my intended purpose however I have verified this has to be done to pass additional signals. My original review is follows.My Bose wired headphones are MFI certified. MFI is Apple lingo meaning Made For iPod. This means that the headphone cable has a microphone enabling hands free calling and can also play, pause, skip and adjust the volume of Apple devices. To accomplish this the cable plug has four positions instead of the usual stereo only two channels. I like to use my headphones when at my Mac Mini however it is difficult to get at in my setup so I needed and extender cable. A standard headphone extension cable will not work with the Bose as the audio channels become weirdly mixed and unlistenable. Bose has an extension cable that is 20ft and way to long for my needs. I purchased the StarTech.com cable to see if it would work and found it will pass all the commands of my Bose cable and the sound is correct. The StarTech four position cable will also provide normal stereo to regular headphones. Recommended.

These cables are good for intended use. Appears to be well made. I'm going to be using them on my motorcycle. You have to have trrs cables in order for this scenario to work.Update. I've had a chance to try these out. They work great. Used them for a full face helmet and rigged one for my half helmet headset also. I'm using these as a work around for my 2011 Harley Ultra Limited. I did not want to buy the Roadtech GPS to interface with my phone and corded headset, but still needed to be able to take an emergency call. As a general rule, I do not recommend riding a motorcycle and talking on the phone. I bought these trrs cables, a USB C (my phone requires this setup, your phone may use different style) to headset and microphone splitter, and some boom style microphones. Run a jumper 3.5mm trs cable from splitter adapter "headset" into aux port AND run a 3.5mm trrs from splitter adapter "mic" to the mic mounted in your helmet. I ran these mic cords through the loops of the corded headset, one for each headset. Note: This ONLY works from the aux position on the Harmon Kardon.