Ember Self-Warming Baby Bottle System with Bluetooth and BPA-Free MaterialsThe Ember Baby Bottle System warms milk or formula with the touch of a button and keeps it cool until you need it. Finally, feedings only require two things: a bottle and milk. With both convenience and precision at the heart of what we do, the Ember Baby Bottle System ensures safe and even warming using convection current technology and our triple check safety features. Multiple sensors detect temperature and liquid levels, so every Bottle is warmed