【3-Level Temperature Adjustment】This product has been upgraded to 3-level temperature adjustment. Level 1: Red light (55-60°C), Level 2: Green light (45-50°C), Level 3: Blue light (35-40°C). Note: ① To prevent the temperature from being too high and destroying the nutrients in the milk, this product adopts an automatic shift-down design. ② When Level 1 (red light) is set, after heating for 15 minutes, the product protection function will be activated, and it will automatically jump to Level 2 (green light) for heating. After heating for 25 minutes at Level 2 (green light), the product will automatically jump to Level 3 (blue light) for heating, and the final constant temperature will be around 40 degrees. 【Compatible Bottles】Compatible with 99% of commercially available baby bottles. Applicable to all material bottles with a diameter of 8cm or less and a height of 16.5cm or less. It can also be used to heat drinks, water, tea, coffee, etc. It is recommended to use a glass baby bottle with good thermal conductivity. 【USB Powered】The milk warmer is very light and comes with a removable hand strap, making it easy to carry. A USB Type-C charging cable is included, and it can be charged directly from a mobile power source, so you can give your baby warm milk even when you're on the go. Please use a 5V2A charging head to ensure the heating effect. 【Instructions for Use】This product has 3 levels of temperature adjustment, and when the power is turned on, the product will flash according to the three colors of red, green, and blue. Press and hold the power key for 3 seconds to turn on the heating. Each time you press the power key, you can switch the heating mode. Press and hold the power key for 3 seconds again to turn off the heating, or you can unplug the power cord to turn off the heating. ⚠️Note: This product only works when the power cord is connected; the product will not heat up even if you press the button after unplugging the power cord. 【Product Specifications】Includes the baby bottle warmer body and a USB Type-C charging cable. A Japanese instruction manual is included.