No unpleasant odor and foodsafe during fermentation: this household fermentation machine does not affect the taste of food. It includes a builtin 75 C thermal protection to prevent excessive heat retention, enhancing safety. thermal insulation inner layer: aluminum film plus pearl cotton create a tight, neatly stitched layer that will not burst the bag. Meticulous workmanship provides longterm thermal insulation for hot and cold dualuse. Precise temperature control: supports temperature accuracy to 0.1 C. Set P0 (start temperature) to 24.0 C and P1 (stop temperature) to 33.4 C. The display shows the current temperature (eg 24.0 C) with the indicator light on during normal heating. When the temperature reaches 33.4 C, the indicator light turns off and heating stops. P1 greater than P0 indicates heating mode. Doublesided heating pad material: front side uses black waterproof fabric for dirt resistance; back side uses white insulation cotton to reduce heat loss. The heating pad is washable, but the interface and other parts should not be immersed in water. Practical use scenarios: Yogurt or dairy fermentation at a stable around 30 C for consistent texture and taste. Vegetable ferments such as kimchi or sauerkraut that benefit from a controlled warm environment. Fermentation starter cultures or probiotic beverages requiring precise temperature maintenance.