Remote control for a power chair?

I want something for the same reason this woman did, to get the chair if it's too far away and something like this would be perfect but it was a one off:

http://ift.tt/1Y534rz


I am surprised that with all the technology we have something so basic doesn't exist already. Am I just missing something?

We've got a Permobil M300, btw.

Remote control for a power chair?