Echo Calls Open Water Game Calls Mallard Smoke Gray. Echo Calls 77725 Open Water Mallard Sounds Smoke Gray Polycarbonate - Specifications for Echo Calls Open Water Game Calls: Manufacturer: Echo Calls Additional Features: Mallard Color: Smoke Gray Fabric/Material: Polycarbonate Echo Calls 77725 Open Water Mallard Sounds Smoke Gray Polycarbonate Echo Calls 77725: Open Water Game Calls Mallard Smoke Gray