There are signs of use. This is a used item, so please only purchase if you are not concerned about this. The instruction manual is also included. It is torn in some places, so please check the photos. It is fine for viewing. It was very useful as you could just add water and press the button for sterilization and drying. Purchased around Spring 2024. Used about 1-2 times a day. After starting solid foods, it was used only for drying without sterilization. The filter replacement lamp is not on. Therefore, the filter has not been replaced. Operation has been confirmed. As water is used, there are areas with mineral deposits. It was cleaned every time, but there are signs of use.