The Baby Brezza Bottle + Breastmilk Warmer warms formula, breastmilk and baby food jars safely, evenly and quickly. The Safe + Smart Baby Bottle Warmer is the only warmer with 2 settings to ensure formula or breastmilk bottles are safely heated to the right temperature. Steady Warm Mode uses a warm water bath to safely warm or defrost breastmilk or baby food to preserve its nutrients (note: traditional bottle warmers warm breastmilk with steam heat, which can destroy breastmilk proteins). Quick Warm Mode uses safe, steam heat to rapidly warm for formula and baby food. The Bottle + Breastmilk Warmer includes a warming basket that fits most bottle brands/types, most storage bags (frozen or thawed) and plastic/glass food jars and it includes an auto-shut-off to prevent overheating.