Durable Plastic 4-Tone Whistle Red and Blue Police Light Lamp Electric Horn for Bicycle High quality ABS plastic, small and convenient, do not add burden to ride,the essentials of riding life Four switches control 4 tone of police whistle, 6 LED lights, Another switch controls the flash modes of the police light Fixed ring fits for 20-30mm handlebar , the cable to horn button is 250mm Easy to be mounted on the bicycle and use , can be as a toy for kids or a horn for cycling Powered: 2 AA batteries (not included)