The Mianyun Condensation Controller (CMD) series products use magnesium chloride as the main moisture-absorbing component and are equipped with a waterproof and breathable membrane independently manufactured by Mianyun. The shell is injection-molded using engineering plastics such as PP-T40/PP-GF30. The breathable membrane and the shell are connected by heat welding, which can effectively prevent the entry of dust, water or other substances. This makes the product have good moisture absorption and breathability, and at the same time has the function of balancing the pressure difference between the inside and outside of the lamp body.