Product Description:. Made of durable ABS. Suitable for handlebar diameter about 2.0-2.5cm. With more than 90 db sound, a loud siren to draw people's attention on street. Keep your kids from danger by warning or noticing others. Easy to be fixed on the bicycle Specification:. Color: red. Material: ABS plastic. Size: 52*53*73mm. Battery Supply: 2 x AAA Battery (Not Included) Package Included:1* Bicycle Bike Electronic Horn.