Features: Constant temperature heating, 3 levels of temperature adjustable: 65 celsius , 55 celsius , and 45 celsius , maintaining more nutrition for baby.? USB power supply, easy to get powered throu more→gh AC adapter, laptop, desktop, and power bank, convenient and flexible to use. With adjustable fastener, size of the bottle warmer can be adjusted, suitable for milk bottles within 5.5-8cm (diameter). Made from premium PU leather, no chemical smell, secure to use, a practical item for baby feeding. Compact size and foldable design, easy for storage and carrying, a nice helper for daily feeding, night feeding, and travel. Specifications: Color: Green, pink, blue, grey, brown (optional)?