Batboard

I see that Batlabs shows a schematic for the flash adapter for HT/CDM series that has an on/off switch. Today, I used a "M" brand adapter that has a switch labeled "A/off/B"
Is this the same adapter or what? What does the "M" adapter's third position do?
What is the "on/off" equivalent to on the "M"s "a/off/b" switch?
I want to build one of these for the HT/CDM series, but want to make sure I'm headed in the right direction.

The double switch means that it can do
mobiles and portables. To do portables, switch to A. Mobiles, switch to B. I haven't looked inside mine, so I don't know how it is wired. The Batlabs schem. may be just for the portable.

Tony

Okay, now.....anyone have one that they can take apart?
If I build one, I'd like to make it with both positions.
I cant believe that "M" charges us what they do for a "jumper" plug!