I got this one straight from The iPhone Photography School. It's super simple. I already use my iPhone headphones with volume controls as a remote shutter release cable. Since I seem to have a bunch of extra Apple headphones, it wasn't much of a sacrifice to cut the cord and remove the extra headphone parts - leaving the volume buttons behind.
It makes me feel like I have a special photography tool in my kit, and not just a random pair of headphones. It's a great addition to my slapdash photo kit. Thanks iPhone Photography School!
P.S. This is my 200th post, what up!!!