Get this loud Bike Siren with 6 red LED flashing lights and you can warn them before they do.It is easily attached to the bike with 2 clamps， one for the light and another for the control switch.Made of Red， white and blue plastic6 Red LED flashing lights4 different siren soundsA switch controlling sounds and lightsBattery: 2*AA Batteries(not included)Suitable for handlebar diameter: about 2.2cm