Which of the following is a feature of the Fox 40 whistle?

The Fox 40 whistle is renowned for its pealess design, which is a significant feature that distinguishes it from traditional whistles. The absence of a pea inside the whistle means that it consistently produces a clear and loud sound, regardless of conditions such as moisture or temperature changes. This reliability is crucial for activities like officiating sports or signaling in various environments where a strong, unmistakable signal is necessary. The pealess mechanism also reduces the likelihood of mechanical failure, which can occur with a traditional whistle that relies on a small ball or pea to create sound.

While the other features mentioned, such as being biodegradable, having a flashing light indicator, or being made of wood, may be appealing in different contexts, they do not accurately represent the characteristics of the Fox 40 whistle. The focus on the pealess design highlights the effective and practical nature of the whistle, making it a preferred choice among sports officials, coaches, and rescue personnel.