Feature:
1. 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.
2. Considering that human ears are more sensitive to 1000‑4000Hz audio, so the treble frequency is set to 4000Hz.
3. Adjustable 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.
4. Made of ABS resin, whistle is environmentally friendly material, hot and cold temperature resistant, light weight, very portable.
5. Widely use, the whistle bulk are great for referees, , teachers, training, survival, emergency, school, sports, give away etc.

Specification:

Item Type: Whistle
Material: ABS Resin
Size: Approx. 49 x 20 x 13mm / 1.9 x 0.8 x 0.5in
Frequency: 0-4000 Hz

Package List:
1 x Whistle
1 x Lanyard
1 x Mouthguard
1 x Storage Box