The Beaba Steril Twin Microwave Steriliser can be sterilised in 4-6 minutes and can hold up to 4 bottles.  Sterilising is crucial at this stage as a babies immune system is not yet high enough to fight off harmful bacteria in milk.  With the Steril’Twin, sterilising will be quick and effortless. It can remain sterilised if left unopened for up to 24 hours, ensuring your baby is not in contact with harmful bacteria. If you are out of the house and have no access to a microwave, cold sterilising is also an option with this product by simply using sterilising tablets (Not supplied). The lid has built-in safety notches to ensure the unit is locked properly and to prevent any steam or hot water escaping.