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 does not affect readability. It was very useful as you could just add water and press the button for sterilization and drying. Purchased around Spring 2024. I was exclusively breastfeeding, only supplementing with milk at night or during times of trouble, so I used it about 1-2 times a day. After starting solid foods, I stopped sterilizing and only used it for drying. The filter replacement lamp has not come on, so the filter has not been replaced. Operation has been confirmed. As water is used, there are areas with mineral deposits. I cleaned it every time, but there are signs of use.