Features USB Power Supply: Utilize any USB 5V 2A power source for versatile use, suitable for USB chargers, car USB ports, and mobile power supplies. Applicable Bottles: Compatible with 5‑8cm/2‑3.1in diameter bottles made of plastic, silicone, glass, and tin cans, ensuring support for various materials. Constant Temperature Preservation: Maintain the original temperature for 24 hours with consistent heat preservation, ensuring long-lasting warmth for the milk. Safe and Flexible Design: Features a 1.2m/3.9ft cord for convenient and secure use, making it ideal for heating bottles during car travel. Convenient Night Feeding: Streamline night feeding, minimize waiting time, and promote better sleep for parents, making feeding sessions more convenient. Specification: Item Type: USB Bottle Warmer Bag Material: Cotton Package List: 1 x USB Bottle Warmer Bag Note: 1. USB power interface output should be 5V 2A, if power supply current is small may cause slow heating or no heating, please use USB 5V 2A standard charger to use.betweendiv>2. This product is just a low voltage USB heater. It heats slowly. This product does not heat bottles quickly. It is suitable for long term wrapping to keep bottle warm after feeding or when you are not in a hurry to feed your baby.between/div> Package List 1 x DIN-Rail Electric Meter 1 x Manual 4 x Accessories