Four rings. Health pot refers to a small household appliance that can cook all kinds of ingredients for the purpose of health care, and belongs to the national compulsory certification product. The fourth ring of green pot refers to the heating zone, which can accommodate four pots with different capacities. Buy four rings for the base of four-ring health pot, because all health pots need to be used together and cannot be used indiscriminately, otherwise it will cause short circuit and so on.