Used only once, and then I got used to boiling in hot water, so I put it in the box and left it unused. There are no instructions. Please purchase if you understand. I'm selling! A microwave sterilizing case that can easily sterilize baby bottles with just water. - Brand: Combi - Function: Sterilizes with just water - How to use: Microwave use - Color: White - Accessories: Cover Thank you for viewing.