BONDEE Bike Bicycle Police LED Light 6-LED Strobe Blue Red Bicycle Safety Light 4 Melody Loud Siren Sound Trumpet Cycling Horn Bells 100%brandnew. Four switches control 4 tone of police whistle, Another switch controls the flash modes of the police light. 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. Mades you be seen and heard at night when riding, enables you a safer riding. A Loud Siren to draw people's attention on street. Material: Plastic. Size: about 5.4 x 3 x 1.6in. Erectionloopfitsthepipewithinternaldiameter28-30mm. Powered: 2 x AA Batteries (Not included).