Primos Hunting 736 Power Mule Deer & Blacktail Grunter Effective for long-range calling Dual-riveted assembly for inhale-exhale operation Reproduces throaty grunts and estrus bleats by simply inhaling and exhaling Effective for long-range calling Dual-reed assembly for inhale-exhale operation Reproduces throaty grunts and Estrus Bleats by simply inhaling and exhaling Includes built-in compass