Pealess; high, medium & low frequency tones; exceptional range You and your hunting and training partners will appreciate the use of a whistle while training and especially while hunting. The Tornado 2000 is a unique pealess whistle that gives a high, medium and low frequency tone for audibility in all weather conditions and is especially audible to dogs who hear well in the 4000 Hz. range. This whistle has exceptional range and attention grabbing power.