Ideal for referees and coaches Loud and ever reliable, the No. 477/T2000 Tornado is the loudest in the Acme range, with a 125 dBA frequency. It delivers the high-quality performance expected from Acme whistles. Shatterproof and bite-resistant. 0.022 lbs. L=3.070 in W=0.511 in H=0.511 in. AIRFAST whistle Made from BPA-free plastic to food-grade standards, available in a variety of colors. Genuine ACME whistle made and rigorously tested in the UK by specialists with over 150 years of experience. The Acme T2000 stands as the loudest whistle in the ACME range, delivering an ultra-high-pitched, powerful sound at 125 dBA. While it requires a bit more lung capacity, its clear, loud tone makes it perfect for the soccer field, effectively cutting through even the most chaotic background noise.