Shop › Black Walnut Megaphone for your cell phone Black Walnut Megaphone for your cell phone $60.00 5” diameter X 6” long. These really do work 5” diameter X 6” long. These really do work Add To Cart Added! You Might Also Like Quick View Sheep coaster with cork backing Quick View Honey Bee coaster with cork backing Quick View Flower Sheep coaster with cork backing Sold Out Quick View Sheep eating, coaster with cork backing Quick View Large mouth megaphone