This new howler produces the crisp clear highs of young coyotes, as well as realistic barks and deeper howls of mature coyotes.Realistic sound matters when you are howling coyotes. The all new Parvo allows you to sweet talk coyotes into range. This new howler produces the crisp clear highs of young coyotes, as well as realistic barks and deeper howls of mature coyotes. With the patented V.E.T.T. system, the Parvo provides superior volume and sound quality giving you the edge in calling coyotes.