This USB Milk Water Warmer is designed with a portable lanyard, which is convenient for you to carry around outdoors. It can stretch to fit most baby feeding bottles, and this universal baby bottle warmer is easy and safe to use. Made with fabric material, this warmer bag is tear resistant and soft. The length of this product is 30 cm and the width is 13.5cm. It is suitable for feeding bottles of various materials. The high level is about 60 degrees Celsius, the middle level is about 50 degrees Celsius, and the low level is about 40 degrees Celsius, and you can shift its levels by the long press for 3 seconds.