Warm milk on the go! The Rechargeable Bottle Warmer makes feeding time stress-free, anywhere, anytime. Perfect for travel, late-night feeds, or daycare. Keep your little one happy with warm milk, easily. Just charge, select temp, and warm! Safe, reliable, and simple to clean. This bottle warmer bag is with 6400mAh large capacity battery, 3-8 hours battery life, the higher the temperature, the higher the power consumption, fully charged in about 2 hours, can not be used when charging.