The function of the car seat belt is that when the vehicle collides or uses emergency braking, the pre-tensioning device will be instantly retracted, tighten the loose seat belt when wearing it, and firmly tie the occupant to the seat to prevent secondary collision. . Once the restraining force of the seat belt exceeds a certain limit, the force limiting device will properly loosen the seat belt to keep the chest force stable. Therefore, the car seat belt plays a role in restraining displacement and buffering, absorbing impact energy, dissolving inertial force, and avoiding or reducing the degree of injury to drivers and passengers. When the seat belt is properly worn, the shoulder straps should span the ribcage and the lap belt should fit snugly against the hip bones. This is done mainly so that the impact of an accident acts on our bones rather than our soft internal organs. Although the buckle will make a "pop" sound after the seat belt is buckled, we should still pull the seat belt to ensure that the seat belt buckle is fastened and not damaged. This is a step that many car owners ignore when using seat belts.Ningbo Chunji Import And Export Trade Co.,Ltd Phone: 150 5806 6299 Email: yama@nbchunji.com Address: No.11, Moganshan Road, Xinqi Street, Beilun District, Ningbo City, Zhejiang Web:  https://nbchunji.en.alibaba.com/