This product includes 2 seedling heat mats, each measuring 10 in. x 20.5 in., providing a large heating area.The core function of the heat mat is to provide a warm environment for plant roots. It can raise the temperature of the root area by up to 20° F above the surrounding air temperature, thereby effectively promoting seed germination and increasing the survival rate of seedlings and cuttings. It has a wide range of applications, not only for seedling insulation but also for heating fish tanks, providing warmth for pets, and more. The heat mat heats up quickly. With insulation on 1- side, the surface temperature can reach 95 to 104 degrees Fahrenheit; however, the surface temperature will vary slightly depending on the actual temperature of the indoor space. At the same time, it features uniform temperature distribution, with almost the same temperature in every corner of the heat mat, ensuring that growing plants are heated evenly and maintain balanced growth.The usage method is simple and convenient: place the heat mat on a solid and well-drained surface, plug it into a power source, and then place plant trays, flower pots, or containers directly on the heat mat. For a warmer root environment, the heat mat can be placed on an insulated surface, but it should be avoided to place it on a cold floor. The product is specifically designed to make the root area temperature 10°F-20°F higher than the grow room temperature..