DescriptionHolder comes fully assembled ready to use. Hook rotates while playing music,you can pause while playing. Hook rotates while playing music,you can pause while playing. Make your own musical mobile holder, can DIY. The musical box is used for fostering infant interest in music,development of visual and auditory.Features- Material: Plastic. - Size: About. 5 x 4.3 x 3 cm. - Color: White. - Music bell is mechanical, with clockwork drive, no battery. - The principle is after the chain through the release of the spring. - Driven by the transmission gear drum rotation, drum has a lot of convex points. - In the process of rotation, the piano playing pieces so as to send out the piano as clear and beautiful music bell. - The musical box is used for fostering infant interest in music, development of visual and auditory.