This BRUDER Light & Sound Module features four buttons for realistic effects: engine sound, police siren, fire siren, and yelp signal—each lasting about 20 seconds. The light activates with sound for added realism. Includes blue, orange, and red caps to suit different emergency or service vehicles. Compatible with all BRUDER vehicles with standard connectors, and comes with an adapter for use on trucks with roof hatches or flat surfaces. Try it in the packaging before purchase. Recommended for ages 4+.