The Tommee Tippee Microsteri is a compact portable microwave steriliser that uses steam to kill viruses and 99.9% of bacteria, perfect for at home or on-the-go.Microsteri: Travel Friendly Steam Steriliser for Bottles, Soothers and Accessories This Microwave Steam Steriliser sterilises up to 4 bottles in just 4 minutes. Compact and easy to clean, the Microsteri is suitable with baby bottles, soothers, breast pumps and feeding accessories, including items from other brands for every day convenience.100% natural steam gets into hard-to-reach places, killing 99.9% of bacteria. Keep the lid sealed for store freshly steamed contents sterile for up to 24 hours, perfect for travel and night-before bottle prep.