6000mAh Built-in Battery: Two 3000 Amh large-capacity power batteries in the market are used in parallel to form a surging power battery, which makes the heat of the milk warmer more stable and more lasting constant temperature. A profect milk warmer for baby. Charging full power by only 6 hours to continue 3 hours usage.6-speed Temperature : Easy-to-use ON/OFF button to set 37~55 / 98F ~131F showing on display control panel , 6-speed temperature contral bottle warmer for your breastmilk and 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, home whenever and wherever possible.The baby bottle warmer use Precision temperature sensor, you can adjust the temperature on your own.Unique Portable Design : Using bottle warmer, you will never worry about water leakage or overheating. It is a revolutionary way to instantly warm breast milk. No need to add water, just like ready water kettle, it can warm the water with USB charge, wireless and no need cable, very portable. Brewing formula anytime and anywhere. Perfect for travel, car, on the go. This is a mobile baby bottle warmer.Baby's Best Helper: This travel bottle warmer is made of food grade PP material. Constant temperature mode could keep the temperature of preset for up to 24 hours. Perfectly comfort hunger and crying baby, don't worried about the warm water at night.It will stop heating when the milk is ready, protect the breastmilk from losing nutrition. (unlike traditional warmers that warm breastmilk with steam heat can easily cause OVERHEAT which can destroy breastmilk proteins).Kindly Reminding: Please make sure bottle bottom fits up the base temperature contral head spring , otherwise the thermostat will be absent method temperature measurement, cause temperature is too high. Please ensure the temperature is appropriare before feeding. It takes about 25 minutes to heat 250ml of water from 25C to 38C(The specific heating situation needs to be analyzed according to the specific situation of use). NOT fast heating