If you look at Apple's official made-for-iPhone (MFi) compatible device list you will see that the ReSound Cala is not listed. The only Kirkland Signature device listed as MFi is the KS 6.0. Having said that, I'm not entirely sure whether Apple's guide is updated. If you take a look at ReSound's Cala guide, you will find the following: "You can personalize your listening experience with the ReSound Smart™ app, and connect with your world thanks to direct streaming from your iPhone®." I speculated before that the ReSound Cala is similar to the Resound LiNX2, and if you check Apple's MFi guide, you will find the LiNX2 listed under ReSound.
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