It is SI and DI; seems to be their older model that they pair with the 9" units, but I think the GT56 is replacing it. It appears that when it is in the traditional mode, it runs on a frequency that doesn't overlap with the livescope. I don't know how it will work, but it only took a few minutes to strap it to the bottom of the TM, and if it doesn't work right I guess I can try something else.

It looks like they could make a cable to link 2 units together that would be plug and play, but I realize they aren't catering to people like me. I'll let you know how it works.