Finally a small hardcover book that sound is not afraid of small hands and has real sounds! This is the first collection that I bought for my 10 month old daughter, it was immediately a great success. The small card format is ideal for the hands of toddlers, the volume is just right, the drawings are adorable, small chips very easy to press, we almost regret that there are only 6 animals book in this collection, but they are very well chosen (in this volume: tit, cuckoo, nightingale, blackbird, pigeon pie) This book works very often and has not needed to see change its batteries almost 6 months later! Just a tip: if you buy it, think immediately to tape the flap at the end of the book, one that hides the battery compartment flat because it tends to attract the curiosity of toddlers and to be abused. Really a book to offer a toddler less than 1 year, educating small ears of this playful way is very nice (and not unbearable to adult ears!).