1. Product description - Material: PU, heat - insulating cotton - Size: 90mm, 120mm - Suitable for baby bottles: Suitable for baby bottles with a diameter of 6.5 - 7cm - Color: High - yellow, high - green - Quantity: 1 piece - Package contents: 1 * vacuum bottle cap, 1 * USB charging cable 2. 42°C constant temperature: This portable baby bottle warmer is made of heat - resistant materials, which can provide safe heat insulation. It heats at a constant temperature of 42°C, effectively keeping the nutritional milk warm. The baby bottle warmer can maintain the temperature of the baby bottle and prevent it from getting cold. Babies can drink milk while it is being heated. 3. Faster heating: The baby bottle warmer uses an imported temperature sensor chip for precise heating. When using a 9V or 10V adapter, 200ml of water can be quickly heated from 25°C to 40°C in about 20 minutes. When using a 5V, 2A adapter, it has a heat - preservation or slow - heating effect and can heat intelligently to maintain a uniform temperature. (It takes 40 minutes to heat frozen milk to 42°C using a 5V 2A adapter.) 4. Suitable for various materials: The portable travel baby bottle warmer is suitable for heating baby bottles made of various materials, such as plastic, glass, or stainless steel. During the heating process, the surface of the portable bottle warmer does not get hot. When the temperature reaches 42°C, it will automatically switch to the heat - preservation mode and support 24 - hour continuous heat preservation. 5. Application scenarios: The baby bottle warmer is suitable for a variety of occasions. It can be used as a baby bottle warmer during travel, on airplanes, trains, and cars, which makes our lives more convenient. We don't have to worry about baby milk. 6. Easy to clean: The baby bottle warmer is made of PU material and does not have a waterproof function. It can be wiped with tissues or other towels. Please note that the baby bottle warmer should not be soaked in water for cleaning.