I was given 3 of these. Only needed one. These heat the bottle to the perfect temperature especially for breastfeeding mommies like me. Baby Brezza Safe + Smart Bottle Warmer - Looking for the ideal bottle temperature? You're getting warm. The Baby Brezza Safe + Smart Bottle Warmer features two warming options: steady for Breast Milk, or fast for formula. It's safe for breast milk because the steady mode uses water to warm it to body temperature in just minutes, which preserves essential nutrients. The quick mode uses steam to safely heat formula or milk quickly. What's more, the Baby Brezza bottle warmer is smart and connected: it comes with a free Bluetooth compatible app that lets you control the warmer from your smartphone and alerts you when your bottle is warm and ready.