NASA Clipper BM-2 or BM-2 Compact is there a functional difference?

[Rowglide]

I am looking at the NASA BM-2 battery monitors, I would prefer the "compact" but do not want to miss out on any features. Is there a difference? I know there are 4 control buttons on the Clipper and only 2 on the compact but I can't seem to find any functional differences.
Any users of either one? Reviews from actual users?
Thanks
Rowglide

[john61ct]

I don't see the Compact's manual online, but quick look at the specs here http://www.nasamarine.com/product-ca...tery-monitors/ implies just the size, maybe not illuminated?

Best to call them and ask.