Thank you for viewing. This is the "Smart Kid Belt." It's a seat belt adjustment device that meets safety standards (ECE R44/04) and can be used instead of a regular child seat. It's compact and lightweight, making it convenient for travel or when riding in grandparents' cars. 【Product Details】 ✅ Target age: 3 to 12 years old (15kg to 36kg) ✅ Easy to install and carry ✅ Usable in Japan (with conformity mark) ✅ Safety aid that adjusts the car's original seat belt for children 【Condition】 Used, but there are no problems with fixing or functionality. 【Included Items】 Main unit only / No instruction manual ※ Please refrain from purchasing if you are looking for a perfect item, as it is stored at home. ※ Immediate purchase is OK. Please feel free to comment if you have any questions.