Features 1.1. Small and easy to carry. 2.2. With this heating bag, baby can drink warm milk at any time, and keep warm at constant temperature. (Insulation requires USB to be connected to the power supply) 3.3. It can be used by connecting to mobile power, charging head, and car USB. 4.4. Adjustable hook and loop fastener, suitable for a variety of bottles (diameter: 55-80mm) Specification Product name: Smart insulation milk bottle cover Applicable products: baby bottles, glass cups Product size: about 29*13cm (11.4"*5.1") Product material: PU leather + heating film + lining Product features: 3 levels of temperature adjustment, continuous constant temperature heating Power input: 5V2A 50HZ Package weight: about 0.1kg Packing volume: about 11.5*3*17cm 3 Color lights to remind, easy to control the milk temperature 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, the mid-range 70% output 55 degrees. 3. Press again and the red light is on, the high-end 100% output is 65 degrees. 4. Press again and the green light is on, and the low-grade 40% outputs 45 degrees. Package List 1 * Baby bottle warmer 1 * Data cable