Features1SAFE AND PRACTICAL: The bottle warmer bag keeps your drinks warm for a long time. It can also avoid burning your hands while holding hot water cup, more hygienic. 2USB POWERED: This milk bottle warmer bag comes with a USB cable, which can be connected to various mobile power, car USB or laptop ports. 3ADJUSTABLE TEMPERATURE: Three adjustable temperature heating, efficient maintenance of nutritious milk, infant can also drink milk while heating. 4TIMING FUNCTION: This USB milk warmer can be set to 30, 60, 120 minutes timer to ensure the safety and convenience of use. 5VISUALIZATION WINDOW: Our bottle heating bag is designed with a thoughtful visual window that allows you to easily and quickly see how much milk is left in the bottle.SpecificationItem Type: USB Bottle Warmer BagMaterial: Flannel Size: Approx. 28 x 14cm / 11.0 x 5.5inTimer Function: Settable for 30, 60, 120 MinutesTemperature Adjustment: Three Levels (High, Medium, Low)Package List1 x Bottle Warmer Bag 1 x Heating Sheet 1 x USB Cable