Do you have an iPhone or iPad? try the CamRanger (http://www.camranger.com
) instead. very precise remote focusing using your iPhone, iPad , or Mac (Windows and Android support is coming very soon)
without touching your camera. Works well for both single frame shots and automates the focus stacking process too. Lots of other features as well like an intervalometer, ultra-long exposure settings, etc.
It's a better solution than a "one trick pony" piece of hardware.
I've now sent them 3 emails with questions about the Android version. No response to the first two. Just sent the third so will see what happens but not optimistic. Doesn't inspire much confidence.