FOX 40 Pearl whistle yellow without cord 9702-0208 The Fox 40 Pearl whistle is the perfect solution for matches where multiple games are taking place simultaneously. It's a great choice for young referees. Properties: the product is light and comfortable to hold. Advantages: No ball to freeze, block or degrade the sound easy to use, reliable and unique sound, audible above ambient noise sound power: 90 dB material plastic