Easy-to-use ON/OFF button to set 37℃~55℃ / 98°F ~131°F , 6-speed temperature control bottle warmer for your baby's milk. 5V-2A USB connector can be used by mobile phone appliances, mobile power supply for power charging, Very convenient for travel, outdoor, hotel, etc. Works great for keeping milk warm on the go (but not for heating milk up from frozen).