Portable USB Baby Milk WarmerKeeps your already hot liquid warm for a longer period of time so that you don't have to leave your bed multiple times during the night You can also plug it into any power bank and carry it around with you for your short outings How to Use 1. Warm up the liquid using a traditional method 2. Pour the liquid into the feeding bottle and wrap the bottle warmer around the bottle 3. Plug in the bottle warmer to any USB power source and set the mode to Red