It is the world’s only 100% hands free or hands on patented interactive deer call. Very versatile call that makes all the social calls of deer from deep buck grunts to fawn bleats in volumes from super low to very loud. Operates totally hands-free when attached to outer clothing. Quick-pin body mount for gun or bow hunters. Adjustable "O" ring creates a wide range of calls--dominant buck, buck, doe, and fawn settings. Inhale activated...reed will never stick in hot weather or freeze-up in cold weather. Automatic shut off...mistakes are impossible to make. Range extender tube expands and contracts to create deeper and louder rutting buck sounds. Volume of call is fully adjustable (loud to very soft) by controlling the amount of air inhaled...simple to use.