The Acme Tornado 2000 whistle is the Worlds most powerful pealess whistle, as used by officials in the NFL, FIFA and FIBA amongst others. Featuring two high pitch frequencies, the whistle offers loudness close to the whistle, and a lower pitch for distance sound, ideal for referee use. Recommended for referees, big stadiums or wherever real power is required. (Caution - As the Tornado 2000 whistle is very loud, it is advised to wear ear protection when using over prolonged spells) Product Name: Precision Training Acme Tornado Black 2000 Whistle  Precision Training Code: FB530