Clearance Sale I Spider Farmer® 10”X20.75” Seedling Heat Mat & Controller Set Fast Germination & Rooting Support - Spider Farmer CA
Your seeds will only germinate if they are provided the right environment. Seeds need to be warmer than room temperature (75-80 degrees, to be exact) to sprout, and so you will see a much higher germination rate with a heat mat. Spider Farmer's Seedling Heat Mat warms the root area of seedling...
I think seed heat mats backed up by local standards are ok. Likely still made in China (what isn't?). This one looks safe.