Never before has producing the rolling fluttering whistle of the pintail been done so easily. The roller built into the High Roller™ makes the whistle flutter automatically just like the whistle of ducks. The High Roller™ also reproduces the mallard drake grunt and whistle of the widgeon and teal. – Built in roller bar that makes the fluttering whistle automatically – Produces the whistle of the pintail mallard drake widgeon and teal