The mc-series consists of the hf2, hf3, and hf5, and uses the moving-coil sound tech instead of more expensive balanced armiture hardware.  The mc3 features a 3-button inline remote control that works with the iPhone.  They’re available in a variety of colors: red, green, blue and black, whatever you need to match your iPod or iPod nano.  The real treat of these is how well they fit – with a variety of tips you are ensured a snug and comfy fit.   The mc3 will retail for around $100 — a small price to pay to get that classic Etymotic sound.

Source: dvice.com