The Portable Bottle Warmer Set by Hopebig is a convenient solution for warming baby bottles on the go. With a 10000mAh battery, this portable warmer offers excellent versatility and can be used anywhere without the need for an outlet. It features 5 temperature control settings, allowing you to choose the perfect temperature for your baby's bottle. Additionally, this warmer is suitable for glass bottles, providing a safe and efficient option for parents looking to heat up their baby's milk or formula while out and about.