I had it prepared but didn't use it, so it's unused. I threw away the box, so it's listed as "Like New," but I've never actually used it in a car. This product currently sells for around 12,000 yen on Amazon. A compact, foldable child seat, suitable for 15-45kg. - Brand: mifold - Model Name: hifold - Suitable Weight: 15-45kg - Safety Standard: ECE R44/04 - Folding Function: Yes - Target Age: 4 to 12 years old Extracted from the Amazon product page: Adjustable Booster - The hifold junior seat uses unique "Multi-Fit" technology, offering a wide range of adjustments, unlike any other booster seat. It can be adjusted to 243 different settings, accommodating children from 4 years old to older children. Suitable for children aged 4 and up, weighing 15-45kg, and with a height of 90-150cm. Portable Junior Seat, Convenient for Travel - Incredibly easy to use. Easily stores in a car and is convenient to carry. The "Multi-Fold" system allows for quick folding, making it convenient and compact for storage, travel, and carpooling. The booster is lightweight and comes with a convenient carrying strap. Ensuring Your Child's Safety — The hifold child seat not only adjusts as your child grows but also provides proper seat belt fit and comfort. It is adjustable in four areas: seat surface, body section, head width, and height. Convenience – This travel booster seat is easy to use and has won numerous awards, including the 2019 Creative Child Product of the Year. It can be used for older children, in grandparents' cars, or when three children need to sit in a row. Safety Verified — This portable car seat complies with "UN(ECE) R44/04" and is approved for use both domestically and internationally, and can be carried and used in countries worldwide, excluding Australia.