[5 Adjustable Temperature Levels & 38C Constant Temperature]: This portable bottle warmer is made of PU material with safe insulation. It features 5 temperature settings: 38C, 42C, 46C, 50C, and 55C, allowing customized heating for different needs and helping preserve the nutritional value of milk. The warmer maintains a steady 38C constant temperature, ensuring your baby can be fed at any time. [Bottle Warmer for Most Baby Bottles]: This bottle warmer includes a removable cap and adjusts to fit various bottle sizes. Its design is compatible with most standard baby bottles, offering a simple, practical, and convenient solution. [Easy to Clean Travel Bottle Warmer]: The portable warmer is easy to clean. Simply use a damp cloth to gently wipe the exterior cover to remove any stains. Note: This is a low-voltage USB-powered bottle warmer. It provides gradual heating and is not designed for rapid bottle warming. [USB Baby Bottle Warmer Bag]: Compatible with various 5V 2A USB power sources such as power banks, laptops, and charging adapters. The package includes 1 x milk bottle insulation cover and 1 x USB cable. [Portable Design]: Lightweight and compact, this bottle warmer is easy to carry and suitable for use at home or on the go, including during travel, hiking, shopping, or while in cars, airplanes, and trains, meeting feeding needs wherever you are.