The importand part of this product is - battery operated
Yes this is bad thinking for the environment, but good thinking in terms of: "buy a product that really gets you there". In this case - a deck of shuffled cards.
Yes there are hand operated eco-friendly ones too. But honestly we are talking friction and function here and those manual thingy's do not get that...they get stuck because of the variations in your hands turning speed on the crank.
So no crank here - no stuck cards in the shuffler.
Fast and reliable as long as the cells are good.
Drawback - cheap plastic on the extractor and do not drop the thing!