USB interface, easy to use, fit for use at home, travel or car. Baby can drink milk while it warms up, provide a circulating constant temperature heating. Efficient maintenance of nutrient milk, it also can preserve heat for a long time. Provide circulating constant temperature heating, a suitable temperature for use. Features -Color:Assorted Color -Material:Polyester -Size:22.00X8.00X7.00cm/8.65X3.14X2.75in -Voltage: 5V. -Current: 2A. - input: 10 W. - The feed bottle warmer is completely handy to carry and can be charged anywhere. - Charge it in the car, with your computer, or buy a charging pack to charge it literally anywhere. - When the weather is getting cold, the warm milk turns cold soon, the warming bag can keep your milk or water warm. - A must-have tool for parent, so that your baby can enjoy healthy warm milk. - The milk warmer mainly keep the milk or water warm. Sandwich structure thermal insulation design, thermal insulation heating core core treatment, safety . Package list: 1 x Milk Bottle Sleeve