With bells, horns & engine whirringSix vehicles and their sounds are to be discovered here. Whether it's an air-raid siren or a ship's horn, a train whizzing by or the rattle of a helicopter, the quiet hum of an electric postbus or the cheerful tinkling of a bicycle bell - everyone will find their favourite sound here.This audio book is one of the most popular books in the series and has already sold over 350,000 copies. Typical for audio books: Each book contains 6 easily triggered sounds with a total playing time of approx. 100 seconds. seconds. Pressing the colour-coded dots on each double page activates and deactivates the sounds. Children from the age of 2 can easily operate the books on their own; for younger children, parents should press the sound buttons, as the fine motor skills and strength of little fingers are not yet sufficient. All titles in the series are subject to strict safety requirements and quality controls. Each sound button is tested for functionality before delivery. The volume of the sounds complies with the European Toy Safety Directive. The books are supplied with 3 commercially available LR 1130 button cell batteries of 1.5 V each. The batteries can be easily replaced. This is the case, for example, when the sounds no longer have the full playing time or can only be triggered with difficulty.