No, there's no manual yet. He mentioned he might need some help with the manual, as he doesn't speak English well.
But, I think that it's very similar to the MB2, feature wise.
Looking at the pics, the main difference is the addition of two analog inputs.
The UB1 has two analog outputs vs one on the MB2.
The UB1 has 3 relays vs two on the MB2. But looking at the pic, it looks like the relays are all normally open, where on the MB2 they can be NO or NC.
Other than that, it should be mostly the same as the MB2.