This is a rack of bells played by servants as entertainment. There are nineteen bells in total, five on the bottom and fourteen on the top. This instrument would be played with wooden mallets for hours on end. At the bottom of the wooden supports you can see a small creature holding up the instrument; this animal is a camel. They probably chose a camel because they used them to transport people on the trade route to India.
Why jade? In Asian artifacts you will commonly see jade being used, but why? It is because in Asian culture jade is considered good luck and a representation of immortality. Often times you will see people wearing jade pendants and jewelry because of this. That is why jade was used in the past and the present.