I'm new...What exactly is a VoxBox?

I have had a few "programs" that I've participated in which are for specific products (chicken nuggets, baked beans (lol), tampons, kitty litter)... seriously such random items!! Anyway, I have had a survey to see if I could get a VoxBox but I didn't get it. So what's in a voxbox? Is it several things or just one item?