Blocks out , crowds, sleep and noise from everyday life The ears can be adjusted to wear this ear more comfortably. The style is simple and elegant, and the headband can be adjusted to tightness and effectively reduce noise. Simple structure, easy to use, not easy to deform, safe to use. Reduce households, bedrooms, self-study classrooms, station wagons, boats, airplanes, factories, construction sites, urban areas, Colour:blue+black Material:ABS Size: 18.5 x 13 x 10cm Package Contents: 4 x noise canceling earmuffs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Blocks out , large crowds, sleep and noise from everyday life The ears can be adjusted to wear this ear more comfortably. Simple structure, easy to use, not easy to deform, safe to use. The style is simple and elegant, and the headband can be adjusted to tightness and effectively reduce noise. Reduce households, bedrooms, self-study classrooms, station wagons, boats, airplanes, factories, construction sites, urban areas,