Bottle warmer: Fast and even heating, good heat preservation, four-layer temperature lock, can maintain the temperature of the bottle for a long time, allowing the baby to enjoy healthy and warm milk. There are 3 levels of temperature adjustment and continuous constant temperature heating. Material: The breast warmer is made of high-quality PU, which is of good quality, odorless, soft and comfortable to touch, wear-resistant and durable, sturdy sewing, tear-resistant, not easy to fade and deform. Easy to clean, wipe with damp cloth. USB charging: The thermos cup has a USB interface, which is very convenient for charging. The voltage is 5V/current 2A, and the voltage is low. It can be charged with a mobile phone charger, mobile power supply, laptop computer, and car charger. Easy to use: The edge of the heat-insulating cover is designed with Velcro fixing, which is convenient to put in or take out, plug and heat, very simple to use. Size fits most 55-80mm baby bottles or cups, fits well and can be used on plastic, silicone, glass, tin cans, cardboard boxes and more. Packing list: 1 x baby bottle insulated lid, 1 x USB cable