Polyester/Plastic Plays 3 different nursery songs (Brahms Lullaby, Twinkle Twinkle Little Star and Rock A Bye Baby). Has On/Off Switch and volume control The hook rotates to the educational music Hole on top and hook on the bottom for easy attachment. This battery-operated music box plays nursery songs for twenty minutes, has an on/off switch and volume control. The hook rotates to the educational music of Brahms Lullaby, Twinkle Twinkle Little Star and Rock A Bye Baby. Hole on top and hook on the bottom for easy attachment. Requires 3 AAA batteries not included.