1pc PU Baby Milk Warmer 5-Speed Adjustment Children's Outdoor Portable Bottle Water Cup Insulation Cover, Suitable For Most Sizes Of Bottles, (Use Reminder: Mainly Used For Heat Preservation, Not Fast Heating, Equipped With Type-CUSB Cable, No Battery Inside, Requires External Power 5V2A Adapter To Use. It Takes About 1.7 Hours To Heat From 0'℃ To 57℃, And About 30-40 Minutes To Heat From 30℃ To 57℃)