Using this hammer is easy. Just pick it up and start tapping. In number mode, every tap makes the hammer count from 1 to 10 out loud. In color mode, it'll light up and tell you the color names. To change the language, look for the language switch on the hammer. For kids aged 9+ months, always supervise them while they play. Don't let them put the hammer in their mouth. After playtime, wipe the hammer with a damp cloth to keep it clean. Store it in a dry place to avoid damage.