LC-1 part Number

I'm getting ready to purchase an LC-1 but I see a couple of different part numbers out there. Which one do I use:

INN-3744 LC-1 Standalone Wideband Controller

INN-3769 (Lambda) what does that mean?

Thanks,
Steve

Oh yeah I'm a nub if you can't tell....

Lambda sensors report 1.0 at stoch .8 when rich and 1.2 when lean as an example instead of outputting 14.7 at stoch, 12.5 when rich and 17 when lean.