[Mr. 16 gauge]

To be perfectly honest, I think it's just another means of getting a duck hunter parted from his money. A gadwall mojo? Why not a mallard with 'magnetic' wings?
FWIW, I think that the mojos aren't as effective (at least in the areas I hunt) as they used to be......I hunt a managed area and every group has 3-4 of the damn things out there spinning.....looks like a mini airport when you stand on your boat and look out over the area! I think that the "long range' shooters popping at 'em as they come in are educating the ducks that spinning wings mean DANGER! As a matter of fact, I'm thinking about selling the one mojo that I do own, as I didn't use it much last season, and when I did use it, it wasn't all that effective.
I do like the fact that this mojo uses AA batteries, however.....I look at my friends who have the mojos with the rechargeable batteries and laugh every time the mojo quits halfway through a hunt because the batteries are either old & won't hold a charge or didn't get charged enough the night before.