Whistle Crasp Sound Light Weight Portable Enviroment Friendly Sports Whistle for Soccer Basketball Volleyball

Independent sound holes on both sides. In volleyball matches, the referee is located in the middle of the court, and the sound can be spread to both sides. Considering that human ears are more sensitive to 1000‑4000Hz , so the treble frequency is set to 4000Hz.

nylon lanyard, the lanyard can easily pass through the tail hole, and the length of the lanyard is fixed by double balls, so you are not afraid of losing or falling. Item Type: Whistle Material: ABS Resin Size: Approx. 49 x 20 x 13mm Celsius 1.9 x 0.8 x 0.5in Frequency: 0-4000 Hz