Feature: 1. SAFE AND PRACTICAL: The bottle warmer bag keeps your drinks warm for a long time. It can also avoid burning your hands while holding hot water cup, more hygienic. 2. USB POWERED: This milk bottle warmer bag comes with a USB cable, which can be connected to various mobile power, car USB or laptop ports. 3. ADJUSTABLE TEMPERATURE: Three adjustable temperature heating, efficient maintenance of nutritious milk, infant can also drink milk while heating. 4. TIMING FUNCTION: This USB milk warmer can be set to 30, 60, 120 minutes timer to ensure the safety and convenience of use. 5. VISUALIZATION WINDOW: Our bottle heating bag is designed with a thoughtful visual window that allows you to easily and quickly see how much milk is left in the bottle. Specification: Item Type: USB Bottle Warmer Bag Material: Flannel Size: Approx. 28 x 14cm / 11.0 x 5.5in Timer Function: Settable for 30, 60, 120 Minutes Temperature Adjustment: Three Levels (High, Medium, Low) Package List: 1 x Bottle Warmer Bag1 x Heating Sheet 1 x USB Cable Note: Manual measurement, please allow 0.4‑1.2in error.