1: 3-in-1 functions - Starting pistol sound for T&F - Whistle for team sport - Siren for swimming 2: Safe for transportation without hazardous gun powder. 3: Environment friendly - gun powder smoke free. 4: Adjustable volume - Adjust according to competition space to avoid damage to audition of youngster. 5: Economical - Use 3 x 1.5V AA alkaline batteries that can be easily purchased at any store. Save high cost consumption of starting caps.
