Enhance your officiating experience with this professional-grade Referee Whistle, crafted from durable ABS resin for superior strength, environmental safety, and resistance to both hot and cold temperatures. Designed with a reinforced whistle mouth to ensure long-lasting performance, this whistle delivers a clear, high-frequency sound optimized at 4000Hz, perfectly tuned for human ear sensitivity between 1000-4000Hz, making it highly effective in various sports and training scenarios. Key Features: · Durable ABS Resin Construction: Made from environmentally friendly ABS resin, offering excellent toughness, temperature resistance, and a stable, chew-resistant whistle mouth for extended durability. · Optimized Sound Frequency: Produces a high-frequency boom at 4000Hz, ensuring the sound is loud and clear for effective communication in noisy environments, ideal for basketball, football, volleyball, traffic control, and military training. · Dual Independent Sound Holes: Features two separate sound outlets that allow sound to be transmitted evenly in all directions, especially beneficial for volleyball referees positioned in the center of the court. · Adjustable Nylon Hanger: Equipped with a nylon lanyard that easily passes through the tail hole, featuring a double ball design to securely fix the hanger length, preventing loss or accidental dropping during use. · Lightweight and Portable: Weighing approximately 30 grams (1.1 oz) with a compact size of 49x20x13mm (1.9x0.8x0.5 inches), making it easy to carry and use wherever needed. Specifications: · Item Type: Referee Whistle · Material: ABS Resin · Frequency Range: 0-4000Hz · Weight: Approx. 30g / 1.1oz · Product Size: Approx. 49x20x13mm / 1.9x0.8x0.5in Package Includes: · 1 x Referee Whistle This high-performance Referee Whistle is a must-have for sports officials and trainers seeking reliable, clear sound signaling combined with durable construction and convenient portability. Perfectly suited for a wide range of activities, it ensures your commands are heard loud and clear.