The Xiaomi Electric Shaver S200 is IPX7-rated and fully washable. The shaving head is detachable and can be rinsed under water for easy and quick cleaning. However, do not soak it in water for extended periods.
For your reference, here are more details about IPX7:
1. IPX7 is a specific IP rating that indicates the device's protection against water, but it does not provide any information about dust protection (hence the X in place of the first digit);
2. The X indicates that the device has not been rated for dust ingress;
3. The digital 7 means the device can be submerged in water up to 1 meter (about 3.3 feet) for up to 30 minutes without water damaging the internal components.
Note:
Please make sure to dry the shaver thoroughly after it comes into contact with water before using it again.