Bullet Points:1. Suitable for Different Materials: The portable travel bottle heater is suitable for heating a variety of materials, and can heat glass and stainless steel respectively. During the heating process, the surface of the portable baby bottle heater will not overheat. When the temperature reaches 42, the temperature will automatically enter the heat preservation mode, and support 24 hours of continuous heat preservation. 2Use Scenario: Breast milk heater is suitable for many occasions. It can be used as a baby bottle heater for travel, airplanes, trains and cars, making our life more convenient, and we don't need to worry about babies drinking milk. 3Easy to Clean: This bottle warmer is made of PU material and has no impervious function. It can be cleaned with paper towels or other wet wipes. Please be careful not to soak the bottle warmer in water for cleaning. 4Safe Voltage: Charging is very convenient, you can use power bank, car, adapter to charge. Our bottle heater is low-voltage design, automatic overheating protection, input 5V 2A, enhance security, suitable for home, travel and going out. 5Multiple Functions: It can store milk cups, beverage cups or coffee cups. The convenient design makes the insulation bag easy to carry when hiking, shopping, and traveling. Three-color light reminds, easy to control the temperature of the milk. Switch function 1. The yellow light of the thermostat link power (battery) button is always on. 2. Long press 3S to turn on the blue light, and the mid-gear70% output 55 degrees. 3. Press again and the red light is on, the high-gear 100% output is 65 degrees. 4. Press again and the green light is on, the low-gear 40% output 45 degrees. 5. Long press for 3S to shut down, keep cycling, output 15% after stopping output. Frequency 3S sensor open circuit and short circuit protection, heating element output open circuit and short circuit protection, 2.5A over current protection. Features: 1. Small and easy to carry, mom is so relaxed. 2. Baby can drink warm milk at any time, keep constant temperature and keep warm. (Insulation requires USB to be connected to the power supply). 3. It can be connected to mobile power, charging head, and car USB. 4. Adjustable circumference hook and loop, suitable for a variety of bottles (Diameter 55-80mm). 5. Four layers of material, firmly lock the temperature (PU first layer, PU second layer, heating layer, comfortable inside). Specification: Name: Smart Milk Bottle Heat Keeper Model: 027 Applicable products: baby bottles, glass cups Size: about 29*13cm (11.4*5.1 in) Material: PU leather + heating membrane+ lining Features: 3 levels of temperature adjustment, continuous constant temperature heating Power input: 5V2A 50HZ Weight: about 0.1kg Packing volume: about 11.5*3*17cm/4.53*1.18*6.69 in Packing List: Baby Bottle Bag*1 Data Cable*1 Manual*1