Hand winding to play charming music、 no battery needed.As you wind it、 you can watch the mechanisms turn. It can help with song recognition for a starting musician or childThis is a charming gift for anyone or to keep for yourself.Type: Intelligence toysAge: 3 Years+Material: Acrylic、MetalDesign Style: InstrumentFeatures: Music、Educational、DIYPuzzle Style: OtherSmall Parts : NoWashing: NoApplicable gender: UnisexPackage weight: 0.161 kgPackage size (L x W x H): 10 x 7 x 5 cm / 3.93 x 2.75 x 1.97 inchesPackage Contents: 1 x Hand Crank Music Box