2.cqc is the national quality certification center, and the safety regulations refer to 3C.
3.ROHS is a special test harmful to electronic and electrical products in EU. For metals, lead, cadmium, mercury, hexavalent chromium and nonmetals, there are six items to be tested.
4.UL is an American safety certification, and the price is around 200,000. I suggest you do FCC, if it is less than 10 thousand, sell it if you can.