The Munchkin Steam Guard™ Microwave Sterilizer uses the speed and convenience of your microwave to sterilize baby feeding equipment in minutes. As well as breast and bottle feeding accessories, you can sterilize any other items that are suitable for microwave use and can be boiled. If in doubt, please contact the manufacturer. WARNING: DELUXE BOTTLE BRUSH INCLUDED WITH STERILIZER SHOULD NOT BE STERILIZED IN THIS UNIT. The Deluxe Bottle Brush is included for pre-washing bottles and bottle accesso