To use the cast source nephrite mattress, firstly, prepare the cast source nephrite mattress, spread the cast source nephrite mattress on the bed, and spread the cast source nephrite mattress flat by hand without wrinkles; The concrete operation steps of using cast nephrite mattress are as follows:

1. Prepare the cast source nephrite mattress.

2. Put the Zhuyuan nephrite mattress on the bed.

3. Smooth the cast nephrite mattress by hand without wrinkles.

4. Find the switch of Zhuyuan nephrite mattress.

5. Just press the knob of the switch in the direction of the arrow in the figure.