Features: 1Premium Material: Made of premium ABS and PU the milk bottle thermal bag is sturdy reliable practical and has a long service life. 2Usage: Put the cold water into the milk bottle and then put the milk bottle into the milk warmer and then use the USB charging milk bottle warmer. 3Keep: When heated to 42 degree centigrades the constant temperature lights up and stays at that temperature. With accurate temperature control and real time monitoring the bottle thermal is made of multiple heat preservation material power saving and sturdy. 4Hook and Loop: With hook and loop the baby bottle warming bag can be adjusted more fit for different bottle diameters and bottle types. 5Multi Layer: Spring temperature control head can accurate measure temperature the rechargeable water bottle thermal bag can keep milk and water at about 42 degree centigrade. Specification: Item Type: Milk Bottle Thermal BagMaterial: ABS PUWeight: 293g/10.34ozColor: AS ShownCurrent: 2APower: 18WBattery: 3000mah x 2P Lithium Polymer Battery(Included)Range: 37 Degree Centigrade 40 Degree Centigrade 42 Degree Centigrade 45 Degree Centigrade 50 Degree Centigrade 55 Degree CentigradeCharging time: 3-4 hours normal temperature to 45 heating time: 45-60 minutes (outdoor use please preheat about 30 minutes in advance)Heat preservation time: After the heating is completed the electricity can support heat preservation for about 2 hours if you do not use the milk warmer to heat the direct heat preservation can support heat preservation for about 5 hours. Package List: 1 x Milk BottleThermalBag1 x Use Manual1 x USB Power Cable Note: Please make sure that the bottom of the bottle is tightly attached to the temperature controller head with spring on the base otherwise the temperature controller will not be able to measure resulting in too high temperature. Please make sure that the temperature is appropriate before feeding.