1pc Baby PU Milk Warmer 26-Speed Adjustment Children's Outdoor Portable Bottle Water Cup Insulation Cover Suitable For Most Sizes Of Bottles (Usage Reminder: Used For Heat Preservation, Not Fast Heating. It Takes About 2 Hours From 0'℃ To 65℃ And About 60 Minutes From 30℃ To 65℃. There Is No Battery Inside. A USB Cable Is Given. An External 5V/2A Or 9V/2A Power Supply Is Required. The Original USB Cable Must Be Used)