Add flashing siren to your kid's bike and watch them having fun. The bike siren is loads of fun with an interactive light and siren. Attach it to your child's bike handlebars, and they'll be ready for action. The flashing siren has a button pad and handlebar mounting clip. The siren has four buttons for a choice of effects and noises to ensure they are seen and heard when out on their emergency adventures. This battery-operated siren comes with 2 x AA (LR6) batteries. To fix the siren, fix the handlebar bracket to the base of the siren using the M4 x 10mm bolt. Remove the M4 x 15mm nut and bolt from the bottom of the bracket. Position the bracket/siren on the handlebar in the desired position, avoiding contact with brake cables. Re-fit the nut and bolt and tighten securely. Attach the button pad next to the siren using the nut and bolt provided, then tighten securely. Do not stretch the pad cable.