The Hunters Specialties 00411 instigator grunt call produces authentic Buck grunts and is extremely easy to use. To switch between young and mature Buck grunts, simply slide the two position adjustment up or down to select the desired tone. This call is perfect for any deer Hunter that wants a simple call that is easy to use but will also gain the attention of Big bucks. If you want to prey on the dominance and curiosity of bucks in your area, don't go into the field without the instigator grunt call. Hunters Specialties continues to manufacture innovative gear that will make you more efficient, more effective and ultimately, more successful. Serious hunting tools.