Modular: Tower design with two trays provides plenty of room for sterilizing while saving counter space; Use either tray or both as needed Clean Steam: Uses steam to sterilize and disinfects common bacteria in minutes; no need for harsh chemicals Custom Clean: Top tray is perfect for nipples, teethers, breast pump parts and smaller items; bottom tray is specially designed for bottles, cups and larger items Clever Design: Directs steam inside bottles and sippy cups for a thorough clean Ready When You Are: Sterilizer stores items for up to 24 hours