thermal insulation inner layer: aluminum film plus pearl cotton material, tight and neat stitching, designed to prevent bursting the bag, meticulous workmanship, longterm thermal insulation, suitable for hot and cold dualuse. Precise temperature control: a temperature control meter with 0.1 C accuracy. Set PO to 24 C and P1 to 33.4 C. The meter shows 24 C, the indicator light stays on for normal heating. When the temperature reaches 33.4 C, the indicator light turns off and heating stops. P1 > PO indicates heating mode. Odor operation: does not produce peculiar smells and does not affect the taste of foods during fermentation. Builtin 75 C thermal protection prevents overheating and enhances safety. Doublesided heating pad: front is black waterproof fabric for dirt resistance; back is white insulation cotton to reduce heat loss. The heating pad is washable, but interfaces and other parts should not be immersed in water. Use scenarios Home dairy fermentation: maintain a stable warm environment for yogurt or other dairy fermentation to achieve consistent texture and flavor. Vegetable fermentation: provide controlled temperature for ferments like sauerkraut or kimchi, improving culture activity and result consistency. Dough and beverage fermentation: use as a stable warmth source for dough proofing or fermenting beverages such as kombucha in cold conditions, ensuring steady performance and reliable results.