This is a bottle warmer that can keep milk warm when you're out and about. You can adjust the temperature in three stages by pressing the power button! I used it once when I went out, but it's been stored by an amateur, so please understand before purchasing. Operation has been confirmed at the time of listing. It is not rechargeable. Three temperature settings: High (approx. 60°C), Medium (approx. 50°C), Low (approx. 40°C) Not only for baby bottles, but also for pet bottles and cans ★