Parameters: 1. Product material: ABS plastic 2. Scope of application: It is applicable for adults and children, which can reduce noise and protect hearing in noisy environment. 3. The shell is of three-layer structure (all-in-one outer shell, inner shell and cover board). 4. The sound insulation decibel can be up to over 27DB (The value can reached only with 3 layers). 5. The earmuffs require no glue (No possibility of toxic substances). Features: 1. Made of lightweight, comfy, high-impact, shock resistant and high temperature resistant ABS material, the earmuffs is tough and wearproof adopting the painting process. Besides, it still looks bright and new after repeated use. 2. Designed in line with ergonomics, the earmuffs with double-layered, soft, natural, comfy and secure-fit lining and sound-absorbing cotton to reduce the resonance so that the high-and-low noise in the environment can be effectively lowered. It is secure-fit to the head and comfy to wear while ensuring sound insulation. 3. The multi-angle rotatable earmuffs with retractable holder and mobile connector enables it to be rotated freely. Furthermore, it can be adjusted to the appropriate distance and angle according to the face, which is comfortable and secure-fit; The length of the earmuffs holder can be freely adjusted to facilitate the wear of people with different face. 4. The comfortable padded arched headband makes it suitable for long-time and secure-fit wear which reduces local pressure on the head. Even better, it is comfortable and not easy to slide off, which provides an easy and convenient protection for a variety of working environments. Packing List: 1 * children earmuff