Optimal Shop 6 Bike Bicycle Police LED Light + 4 Loud Siren Sound Trumpet Cycling Horn Bell 100% brand new. 4 Loud Siren Sound.6 red blue led light with bike siren. Keep your kid from danger by warning or noticing others.A switch controls the flash modes give the effect of flicker.Easy to be fixed on the bicycle. A Loud Siren to draw people's attention on street. Material: Plastic.Size: about 13 x 7.5x 3.5cm.Powered: 2 x AA Batteries (Not included).