Features: 1, keep warm when eating 2, good insulation effect 3, safety voltage 5 v 4, every milk bottle can use it 5, comfortable to wear specification: Material: cotton, PC Size: 6.5 m × 10 cm Heating power: 5W Power input: 5V / 1A Note: 1. Due to manual measurements, please allow an error of 1-3 cm. Make sure they don't mind before bidding. 2. Due to the difference between different displays, the picture may not reflect the actual color of the item. Thank you!