1 - 5 adjustable temperature levels and constant temperature of 38 - This portable bottle warmer is made of PU and is safely insulated. 5-level temperature setting 38 , 42 , 46 , 50 , 55 temperature heating for different requirements, effective heat preservation of nutritious milk. The bottle warmer can be kept at a constant temperature of 38, so the baby can drink at any time.Bottle warmer for most feeding bottles- Bottle warmer with removable closure. Adjusts according to bottle size, fits almost all normal milk bottles, simple shape and convenient and practical. 2 -Easy to Clean Travel Bottle Warmer - The portable bottle warmer is easy to clean, use a wet paper towel to gently wipe the stain on the leather cover, you can complete the cleaning job. Note: This bottle warmer is a low-voltage USB warmer. It heats up slowly. It is not a product that can heat a baby bottle quickly. 3 -USB Bottle Warmer - Compatible with many types of USB 5V 2A devices such as power bank, laptop, charging adapter, etc. 4 -Package includes -1 insulated milk bottle cover; 1 USB cable. 5 -Portable - Lightweight, small size, easy to carry, can be used at home, travel, hiking, shopping, aeroplanes, trains and cars, can meet your child's milk needs anywhere and anytime.