Thank you for your inquiry regarding this item from Prime-Line Products. This seat belt adjuster pad, designed for lowering the shoulder strap for young children installs easily over the car's belts with 4 snap-together buttons. This item has a lower pad that attaches to the horizontal span of the seat belt, and a diagonally positioned pad that attaches to the diagonal shoulder strap of the seat belt. Each of these pads have 2 buttons that allow for a quick, but secure fastening of the adjuster pads.
For additional questions regarding this item, or any other product manufactured by Prime-Line Products, please call their toll free number at (877) 649-9740, or contact them by email at firstname.lastname@example.org