Flextone Thunder Yelper Call Gen 2 Brown. Seductive hen turkey clucks and purrs are often difficult to master with diaphragm and box calls but the Thunder Cluck-N-Purr simplifies things with an easy-to-use handheld hybrid design. Blow across the double reed through the ergonomic mouthpiece to drive thunder chickens wild and bring them in close. Specifications for Flextone Thunder Cluck-N-Purr Gen 2 Game Call: Manufacturer: Flextone Color: Brown Features of Cyclops Thunder Game Call Seductive clucks and purrs Small double reed for volume control Close- to mid-range calling Easier to use than diaphragm calls Ergonomic mouthpiece for consistent tones Package Contents: Cyclops Thunder Game Call Flextone FLX-FLXTK127: Thunder Yelper Call Gen 2 Brown