Features: Adopt food grade material both internal and external, physical reaction heating, No plugs, No batteries. Warm in 60 seconds, perfect for night feeding and carry on the travel. The temperature is constant at 32-34℃, which is most close to breastmilk temperature, heat continuously for 1 hour. Protects the essential nutrients, prevents rapid bacterial growth. Quick charge in boiling water, heat sterilizer or in microwave with pot. (Pot not included) Warmer can be rechargeable up to 300 times. HOW TO Charge: - Charge in boiled water for 30 minutes. Make sure drown the warmer. - Charge in steam sterilizer for 30 minutes. - Most quick way: charge in Microwave. Must put in charging pot. 1. Put warmer in pot, tight the cover, then put them into Microwave. 2. First heat: Heat 70-80s, depending on power of your Microwave. (700-750 matt, 80s. 800-1200 matt, 70s) Take out and shake 30s 3. It will make sound when shaking, if not, heat more 10s. 4. Second heat: Heat 30s in microwave and shake 10s, the button will turn red to blue. 5. Let cool for 75 minutes. It is ready to carry and use. Note: Please allow warmer cools down to room temperature before use, Otherwise the warmer may not work or Cause the milk to be overheated.