Your seeds will only germinate if provided with the right environment. Seeds need to be warmer than room temperature (75-80°F) to sprout, so using a heat mat along with Seed Starter Trays can greatly increase your germination rate. Spider Farmer’s Seedling Heat Mat warms the root area of Seed Starter Trays by 50-77°F above the ambient air temperature, significantly enhancing the germination process and improving the success rate of seedlings and cuttings. Warm reminder: Currently the temperature of this heating mat is displayed in Fahrenheit and cannot be switched to Celsius. Package contents: 1x  52 X 25cm Seedling Heat Mat 4x  Seed Starter Trays