Why are there black marks on the water dispensing button of the Xiaomi Insulated Kettle 1.8L?

The water dispensing button is designed with two inlaid parts: an inner layer and an outer layer. This structure can cause press marks due to the contact between the transparent outer surface and the underlying rubber. These marks are normal and do not affect the functionality of the device.
When you press the button, the temporary marks appear, but they will disappear once the button is released. This design ensures a secure seal while maintaining performance, allowing for efficient operation without any impact on usability or long-term durability. Rest assured, these marks are a standard aspect of the design.