RE: Innovator MD530
Howdy,
A mate told me the I J S switch allows you to select which type of transmitter you are using with the helicopter. Some peeps out there may prefer to fly with their own radio instead of the one bundled with the Innovator.
I= Innovator & Futaba
J=JR
S= not idea
My friend could be pulling my leg, but it somehow makes sense. Hope it helps.
Hong