Bottle insulation cover is made of high quality fiber cloth and heating piece material, no irritating odor, no toxic substances, uniform insulation, soft, can be assured for baby use. With intelligent 5-step temperature adjustment, 38℃, 42℃, 46℃, 50℃, 55℃ 5-step precise temperature control, adaptable to a variety of process formula milk powder, can be adjusted to the right temperature that is set. Heats in 15–20 Minutes: Reaches full temperature (~55°C) within approximately 15–20 minutes, depending on the environment and bottle contents. Baby bottle cover can accommodate soy milk, drinks, juice, coffee, water, milk, etc., so you can drink hot drinks anytime and anywhere. Perfect for outdoor travel, driving trips, use on the go, hiking, shopping; just plug into a compatible USB-A port on a portable charger. Car Travel Use: Do not rely on built-in car USB ports – they often lack enough power. ✅ Use a USB-A car charger adapter that plugs into your vehicle’s 12V cigarette lighter and provides 5V-2A or 9V-2A output. What’s Included: 1x Digital Display Baby Bottle Warmer Sleeve 1x USB Charging Cable Lightweight and easy to store in diaper bags, carry-ons, or car compartments—perfect for trips and everyday outings. Keep your baby’s milk warm and ready with the Digital Display Portable Baby Bottle Warmer Sleeve—a travel-friendly, USB-powered solution for feeding on the go. Simple Operation: Connect to power via the included USB cable (USB wall charger not included). Long-press the power button for 3 seconds to turn it on. Smart Gradual Heating: The warmer automatically progresses through temperature stages—38°C, 42°C, 46°C, 50°C, and finally 55°C, then holds steady at 55°C to keep milk warm. Manual Temperature Control: Easily switch between heat levels with a short press of the power button. Insulated Design: Soft, fabric outer layer with built-in insulation to retain heat while remaining lightweight and flexible. Power Requirements: Must be powered by a USB-A source with 5V-2A or 9V-2A output. Underpowered ports may not work reliably. Car Use Tip: Standard car USB ports often supply insufficient power. For consistent heating performance, we recommend using a USB-A car charger adapter that plugs into your vehicle’s cigarette lighter port and provides the correct output (5V-2A or 9V-2A). These adapters act as external power sources, making the warmer fully functional during car travel. Reliable, safe, and perfect for parents on the go.