Function:Made of high quality plastic, non-toxic safety, sturdy and durable. Lightweight and portable Just put it in your pocket. Very suitable for school referees. Easy to use and clear sound. Excellent workmanship and delicate design. Specifications: Condition: 100% Brand New Material: Plastic Weight: Approx. 43g/1.5oz Size: Approx. Package List: 1.6 x 0.8 x 0.6 inches (4 x 2 x 1.5 cm)