Haydels Speck Goose Call. Very easy blowing Specklebelly call that is tuned slightly higher pitched for an increase in range on your two note yodels. Very quick responding for rapid yodeling. Clucks easily for close in work.DOUBLE ?O? RINGS. Specifications for Haydels SP-04 Speck Goose Call: Manufacturer: Haydels Species: Goose Package Contents: Haydels SP-04 Speck Goose Call Haydels SP-04: SP04 Speck Goose Call