The soothing classical tunes and beautiful illustrations in this book are a perfect way to lull little children to sleep. The gentle illustrations of nocturnal owls serenading animals include buttons to press to play the tunes, and finger trails and textures to feel on the pages. WARNING! This product contains button or coin cell batteries which are dangerous. Dispose of used batteries immediately. Keep new and used batteries away from children. Batteries can cause serious injuries if they are swallowed or placed inside any part of the body. If you think batteries may have been swallowed or placed inside any part of the body, seek immediate medical attention. Different types of batteries (i.e. Alkaline and Zinc) or new and used batteries are not to be mixed. Only batteries of the same or equivalent type as recommended are to be used. Batteries are to be inserted with the correct polarity. Exhausted batteries are to be removed from the product. The supply terminals are not to be short-circuited. Do not throw batteries into a fire. Batteries should never be left in the product when not in use for long periods of time. Non rechargeable batteries are not to be recharged. Rechargeable batteries are to be removed from the product before being charged. Rechargeable batteries are only to be charged under adult supervision. This product contains batteries and electronics that may be harmful to the environment; they should not be discarded with normal household waste but taken to your local collection centre for recycling. Please retain this information for future reference.Battery removal and installation instructions: With a screwdriver, loosen the captive screw and remove the lid to the battery compartment keeping it away from children. Insert the new button cell batteries as shown in the polarity diagram (+/-) inside the battery compartment. Lower the lid back onto the compartment and re-tighten the captive screw.