This is the electric yogurt maker that automatically maintains the optimal temperature for fermentation, producing up to two quarts of natural, healthy yogurt in 4 1/2 hours. Simply heat milk on a stovetop until it reaches 120° F (food-grade thermometer included), allow it to cool to room temperature, and pour the milk into the plastic container. Combine the provided yogurt culture with the milk and turn on the device; the yogurt maker incubates the yogurt cultures at 110° F--the ideal temperature for sustaining healthy yogurt bacteria and producing creamy, rich yogurt without the preservatives and chemicals found in most store-bought brands. Once the yogurt is made, you can add fruit, sweeteners, vanilla extract, or other flavor-enhancing ingredients. The yogurt stores in a refrigerator for up to three weeks. Includes cultures for making one quart of regular yogurt and one quart of probiotic yogurt and a perforated cotton bag for making yogurt cheese. Plugs into AC. 10" H x 7 3/4" Diam.