The microwave steriliser can sterilise up to 5 vials of different sizes, several teats and accessories in 4 minutes. The holes in the lid of the sterilizer allow the steam to escape, which contributes to a clean cleaning inside and outside. Sterilizes in 4 minutes at 1100-1500 W, 5 minutes at 850-1100 W or in 7 minutes at 475-850 W.