Feature: 1. Portable Size: Milk bottle warmer adopted soft lint fabric and hook and loop fasteners design to fit tightly into the bottle, with a compact size for easy to carry and storage. 2. Heat Preservation: USB milk bottle warmer with 42°C circulating constant temperature heating, which can maintain the liquid at a warm temperature and prevent it from getting cold. 3. Practical Tool: USB baby bottle warmer is a perfect solution for parents to conveniently, safely and easily warm baby bottle while in the traveling, allow your baby can drink warm milk both at home or outdoors. 4. USB Charging: Baby milk heater come with a long USB cable, just connect the cable into any power bank, vehicle USB, laptop interface, charging adapters, etc. to power the baby bottle heater. 5. Heating Time: Baby bottle warmer takes about 60 minutes to heat 25℃ cold water or milk to 42℃ at room temperature, and about 20 minutes to heat 35℃ warm water or milk to 42℃ at room temperature. Specification: Item Type: Baby Bottle Warmer Material: Lint Style: #1 (A heat preservation sleeve). Package List: 1 x Baby Bottle Warmer Note: The main function of this bottle cover is heat preservation, you can heat while feeding, the heating is slow, if you need to heat, please plug in 30 minutes ahead of time, unplug the power supply when not use!