This is a 12V car cigarette lighter socket to DC plug adapter. It is a used item. Based on the DC plug specifications, it is likely an adapter for using a portable DVD player in a car. It does not perform voltage conversion, so the input is 12V and the output is 12V. I reconfirmed the power-on check before listing. Pin plug section Outer diameter: Approximately 4.0mm / Inner diameter: Approximately 1.7mm Length: Approximately 10.5mm Cable length: Approximately 140cm I do not know the details, so please consider purchasing after confirming the shape and size of the pin plug. Since it is a used item, there are scratches and dirt, so please refrain from purchasing if you are expecting a product as beautiful as new. Shipping is planned via Yu-Packet Post Mini. Due to thickness restrictions, it will be simply packaged. Thank you for your understanding regarding used items.