Specifications: Type: Bottle Warmer Cover Material: Fabric Color: Pink, Blue, White, Black (Optional) Voltage: 5V Current: 2V Inner diameter of insulation sleeve: About 5.5cm-7.5cm/2.16"-2.95" Features: 1. Fast Bottle Warmer for Travel: It is suitable for feeding bottles of various materials. The high level is about 60 degrees Celsius, the middle level is about 50 degrees Celsius, and the low level is about 40 degrees Celsius, and you can shift its levels by the long press for 3 seconds. 2. Material: The milk warmer is made of high quality fabric material, comfortable to touch, tear-resistant, strong and durable, wear-resistant, not easy to fade and deform, long service life. 3. Bottle Heating Sleeve: There are good insulation, fast and even heating, can firmly lock the temperature, keep the bottle temperature for a long time, so that your lovely kids enjoy healthy and warm milk , you no longer have to worry about your kids drinking cold milk. 4. Easy to Use: Easy to install or remove, simple and convenient to use, three temperature adjustable, hands not hot. Can be used for a variety of materials, suitable for the diameter of 5.5-7cm baby bottles, glass, milk cartons, etc., offering more convenience for daily life. 5. Portable: Lightweight, small in size, easy to carry, can be used at home, traveling, traveling, hiking, shopping, airplanes, trains and cars, can meet your kid's milk needs anywhere and anytime. Package includes: 1 x Bottle Warmer Cover 1 x USB Cable Notes: Please Allow 2-3 cm Difference Due To Manual Measurement.Besides Different Computers Display Colors Differently, The Color Of The Actual Item May Vary Slightly From The Below Images, Thanks For Your Understanding(1 inch = 2.54 cm)