Thank you for viewing. I installed this in my car for a trip of about 1-2 hours, but I purchased a different junior seat, so I am listing this as 【New, Unused】. After that, it was stored at home. Thank you for your understanding. The following is a quote: How to use for children (6 years old and above, 100~140cm) 1. Have the child sit in the back seat with good posture. 2. To prevent unnecessary movement on the seat, have the child sit near the seat belt anchor. 3. Remove the clips from the loops (seat belt guides) on both sides of this product to pass the seat belt through. 4. Close the clips of the seat belt guides and adjust the length of the loops so that the seat belt passes directly over the child's shoulder. 5. If the belt is on the child's neck, head, or face, readjust the clip position of this product. ＜Notes＞ ● This product is an auxiliary device for children using the seat belts equipped in the car and cannot be used as a substitute for a child seat (including junior seats) that is mandatory for children under 6 years old. ● Please use the "seat belt guide" for children who are approximately 100~140cm tall. ● This product can only be installed on 3-point seat belts. ■ Product Material Cover: Polyester, Filling: Urethane ■ Product Size W420mm x H570mm x D120mm (D90mm excluding the overhang on both ends)