NCVI Fast Bottle Warmer and Sterilizer is a 4-In-1 multifunctional product that can be used for warming milk, heating food, sterilizing and defrosting.It easily warms breastmilk or bottle formula. This baby bottle warmer takes need 8-10 minutes to heat up 4oz milk from 39℉ to 104℉.It has a constant temperature mode, that means once you set the temperature, the milk will be warmed up in a constant temperature. For best results, warm milk at 99℉ to prevent nutrient loss.This product is easy to use in three simple steps-add water, place bottle holder, and choose heating mode and finish. This product is high quality and great for gifting!I highly recommend this product!