Warmer + One AdapterThis bundle pairs the Babys Brew Portable Bottle Warmer and an adapter of your choice, giving parents the freedom to safely warm breast milk or formula directly in their favorite bottles no transferring, no spills. Please see adapter fit chart in images to ensure proper adapter fit with your bottle. With four precise temperature settings, cordless portability, and a custom adapter for for your bottle, its the perfect duo for feeding on the go.