Features1Temperature 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. 2USB 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. 3Adjustment Temperature Control: The bottle cover warmer provides flexible and accurate temperature adjustment, with every click leading to a 1 change. 4User Safety: This device has a protective design to prevent burns, which is convenient practical as well as safe for you. 5Waterproof and Easy To Clean: Made of waterproof material, the bottle cover warmer can be washed entirely under water, making cleaning a breeze after use.SpecificationItem Type: Milk Bottle Bag WarmerMaterial: Oxford cloth (artificial leather) + fleece + knitted cotton + siliconeSize: Approx. 30x14cm / 11.81x5.51inAdjustable temperature range 40-60Bottle Diameter: approx. 8cm/ 3.15in in diameterPackage List1 x Thermal Sleeve 1 x Instruction Manual 1 x USB Cable