Provide some protection against dust, or some anti dirty things.
color: White / Black
Material: fiber optic fabric Input voltage 0.3V-0.5V(V) Charging method: USB Battery capacity: 400mAh Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2. Please allow slight dimension difference due to different manual measurement.