Yes According to the introduction of personal library, the water in mi band leads to a black screen, which will have a certain impact on the hardware. Moisture entering mi frequency band will cause short circuit, component damage or corrosion, resulting in hardware damage or performance degradation. Water is an inherent risk factor of electronic equipment, because water has conductivity, which can lead to short circuit or damage. In addition, water will cause corrosion, and long-term contact with water will lead to rust damage of internal components.