Feature:1. Temperature Retention: The bottle bag warmer can maintain the temperature of food and drinks for a long time, ensuring that your drinks stay warm whenever you need them.2. USB Connectivity: Equipped with a USB wire, this bottle bag warmer can be connected to various power banks, car USB ports, and laptop interfaces for easy heating on the go.3. Adjustment Temperature Control: The bottle cover warmer provides flexible and accurate temperature adjustment, with every click leading to a 1℃ change.4. User Safety: This device has a protective design to prevent burns, which is convenient practical as well as safe for you.5. Waterproof and Easy To Clean: Made of waterproof material, the bottle cover warmer can be washed entirely under water, making cleaning a breeze after use.Specification:Item Type: Milk Bottle Bag WarmerMaterial: Oxford cloth (artificial leather) + fleece + knitted cotton + siliconeSize: Approx. 30x14cm / 11.81x5.51inAdjustable temperature range 40-60℃Bottle Diameter: approx. 8cm/ 3.15in in diameter.Package List:1 x Thermal Sleeve1 x Instruction Manual1 x USB Cable