Temperature Control: Intelligent three gears temperature control can be adjusted according to the seasonal temperature Universal: Suitable for a variety of milk bottles, while installed on, the heat preservation, suitable for all kinds of milk bottles USB Port: USB jack is available for charging, multiple charging modes, convenient charging and easy travel Magic Sticker: With magic sticker design, you can adjust the size as you need Note: Long press for 3 seconds to open or close, and press once to adjust different gears Milk bottle cover material: Cloth Heating sheet material: Silicone alloy hair wire Color: Blue, Pink, White(optional) Size(L x W): About 30 x 13.5cm \/ 11.8 x 5.3inch Inner diameter of insulation sleeve: 55mm-75mm \/ 2.2-3inch Heating sheet: Voltage: 5V Current: 2V Temperature 50 C-60 C Package included: 1 x Bottle Warmer 1 x USB Cable