Press the buttons to hear the numbers 1 to 25 said out loud and practice counting both forward and backwards! Babies and toddlers will love to learn their numbers with Let's Learn 123s. Large numbers on each page have dotted lines that make it easy for little hands to practice tracing. With delightful illustrations, key first words, and fun sound buttons, this book is the perfect introduction to counting! Sound module has an on/off switch and batteries are easily replaceable.