Not bad. All materials are food-grade materials, which are safe and hygienic, contain no BPA and have no harmful effects on human body. The detachable stainless steel filter screen is built in the health-care cup to filter impurities such as tea residue and scale, so that the water quality is purer, and multiple functions such as one-button heating and intelligent heat preservation are realized, which is convenient for users' health-care needs. Lvjian Smart Music Health Cup is a smart water cup that integrates health, music enjoyment, intelligent management and other functions.