Comfortable and non-slip: the package is comfortable and firm, it is not easy to slip. The size of the product is suitable for; most baby bottles on the market. Non-toxic and durable: The bottle warmer bag is made of non-toxic and durable materials, safe for your health. It has resistance to wrinkles and its resistance to tearing. deformation, greater resistance and capacitance. Adjustable Velcro: four layers of material to lock in temperature. (first layer in polyurethane, second layer in polyurethane, heating layer, comfortable interior). Adjustable Velcro closure, suitable for a wide variety of clothes. of bottles (diameter: 55-80 mm). USB heating: with this heating bag, baby can drink warm milk to at all times and keep warm at all times. constant temperature. It can be used by connecting to; the mobile power supply, grave; the charging head and the car's USB port. (Insulation requires the USB port to be connected to power). milk, coffee cups, tea cups coffee, etc. Thanks to its practical design, the heating bag is easy to use. carry when hiking, shopping and traveling. Description: Product Name: Smart Insulation Milk Bottle Cover. Applicable Products: Baby Bottles, Sippy Cups made of glass. Product dimensions: approx. 29 x 13 cm. Product material: PU leather + heating film + lining. Product features: 3 levels of resistance; Temperature adjustment, continuous constant temperature. Power: 5V 2A 50Hz Package weight: about 0.1 kg. Package volume: approx. 11.5 x 3 x 17 cm. 3 colored lights for reminder, easy milk temperature control Switch function: 1. The yellow light of the on/off button (battery) of the thermostatic connection always lights up. 2. Long press 3S to turn on the blue light, the center area of 70% outputs 55 degrees. 3. Press again and the red light turns on, the high end output is 65 degrees. 4. Press again and the green light comes on, and the 40% low intensity exceed 45 degrees. 5. Long press to power off and continue. When the output is off, the output is 15%, the 3S frequency sensor protects the open circuit and short circuit, the output heater protection, short circuit protection, 2.5 A overvoltage. Contents: 1 bottle warmer. 1 data cable. 1 user manual (French not guaranteed).