Nicholas Skinner

Freelance website and web application developer

Fixing The Exspect EX864 iPhone Headphone Adapter For ithlete

I recently purchased the Exspect EX864 iPhone Headphone Adapter which basically extends the existing 4 pin headphone socket (speaker/microphone) for your iPhone. It is useful if you have e.g. a large iPhone case such as the Otterbox Defender and are looking to connect a 3rd party device that would otherwise be blocked by the case, such as the ithlete Receiver.

After testing the device I found it worked in terms of passing through earphone audio but not in terms of passing through the microphone. Further testing with a multimeter showed that the 4th ring (sleeve) which is the microphone connection was not passed through.

Since the microphone is the sleeve connection (the only one easily accessible on the socket) I was able to run a wire down the side of the case from the top socket to the 4th ring on the plug, solder it in place, and finish it off with some heat proof tubing. It seems to work fine in terms of fixing the microphone problem.

Note: I also purchased the iFrogz Fritz Headphone Adapter which had the same problem as the EX864 in terms of the microphone connection not being wired through.

6 Responses to “Fixing The Exspect EX864 iPhone Headphone Adapter For ithlete”

  1. Jake Says:

    Thanks for the review. I wonder if the control (volume up/down + answer call) works with this adapter?

  2. admin Says:

    From what I understand the 4th (Microphone/control) pin is used for volume/play/pause so any adapter with all 4 pins passed through should work.

    You can find further information on how the headphone remote works at

    Another adapter cable I came across which should work off the shelf is the one from LifeProof product page mentions “Allows use of the earphone inline microphone and button controls” I recently ordered one however have not yet received it.

  3. diane Says:

    I’m looking to buy an ithlete and have an Otterbox Commuter. Do you think the LifeProof adapter will work? Ithlete recommends removing the case (and it’s already broken on me once)

    Radtech is also showing 3 and 4 pin extenders, I am waiting to hear back from them.

    Thanks so much, this little issue is kind of holding up my purchase!

  4. admin Says:


    The LifeProof adapter worked for me, although I have since stopped using ithlete – started/stopped using it a few times, but just could never seem to determine any meaningful information from it personally.

  5. diane Says:

    Thanks for the reply! Radtech says theirs should work, and they know it will fit my case so that’s what I went with.

    Did you just not use the ithlete enough to get the data from it? I kind of fear that myself as it sounds like you really need to use it consistently to get the best results from it.

  6. admin Says:


    I used it consistently – last time it was for a period of two months, with a reading every day (this was the first version, they have since done an update which I have not tried). For me I just could not seem to match up the readings with how I was feeling, and the readings seemed somewhat random and very susceptible to errors based on changes in heart rate bpm which never seemed to be consistent. I was following their guidelines in terms of taking the readings at the same time, taking them in the same position (standing) etc.

    Also in case it is of any interest there is another app called BioForce HRV which from what I understand is based on ithelete and uses the same hardware but uses a slightly different system to get the measurement, and calculates the results differently. Have not tried it myself however.

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