[Premium Material: Made of premium ABS and PU milk bottle thermal bag is reliable practical and has a long service life. Usage: Put cold water into milk bottle and then put milk bottle into milk warmer and then use USB charging milk bottle warmer. Keep: When heated to 42 degree centigrades constant temperature lights up and stays at that temperature. With accurate temperature control and real time monitoring bottle thermal is made of multiple heat preservation material power saving and . Hook and Loop: With hook and loop baby bottle warming bag can be adjusted more fit for different bottle diameters and bottle types. Multi Layer: Spring temperature control can accurate measure temperature rechargeable water bottle thermal bag can keep milk and water at about 42 degree centigrade.]