USB RECHARGEABLE & FAST CHARGING: This portable bottle warmer features a built-in rechargeable battery that charges quickly via USB, making it ideal for travel and on-the-go feeding.6 ADJUSTABLE HEATING LEVELS: Choose from 6 precise temperature settings — 37°C, 40°C, 42°C, 45°C, 50°C, and 55°C — to warm breast milk or formula to the perfect temperature for your baby.DIGITAL TEMPERATURE DISPLAY: The clear LED display shows the current temperature and heating status at a glance, allowing for easy and accurate monitoring during use.