I hope this item can be used by someone who understands that it is a used item. Everything in the photos is included, and there are no instruction manuals, etc. The following is the manufacturer's product description. The ultra-three-dimensional "3D Ergonomic Seat" that accepts the baby's body as it is. The highest-grade flexible model that does not hinder the movement of the baby being held. "Cool Air," a mesh material that pursues breathability, provides a cool and comfortable hold. [Features] Ergonomic seat that changes shape according to growth and supports forward-facing carrying. Comfort continues at any age, and it's No. 1 for parent-child comfort. 1. From newborns to toddlers (3.2kg to 20kg) Ergonomic seat that changes shape according to growth and supports forward-facing carrying. 2. Shoulder straps that can be crossed & waist belt with waist support: Distributes weight evenly. Makes it less tiring even for long periods. 3. Head & neck support: Supports firmly in 3 steps until the neck is stable. 4. Built-in hood for sun and wind protection.