Fangrui Product Details All-in-one Heating Mat: This Upgraded Heating Mat Is Combined With A Thermostat To Help Us Control The Temperature And An Ntc Probe To Continuously Monitor The Soil Temperature, Which Is More Convenient And Saves Us The Cost Of Extra Controllers And Probes. For Sprouting Seedlings: It Can Promote Seedling Germination And Improve Seedling Survival By Heating The Planting Tray And Maintaining The Temperature At 20to 45, The Optimal Temperature For Seedlings. Size For Planting Trays: It Has A Size Of 10 X 20.75 Inches (527x254mm), The Size To Be Compatible With A 1020 Planting Tray. By Constantly Producing Even And Soft Heat, It Helps Seedlings Grow Healthy And Strong. Ip67 Waterproof Rating: Its Surface Adopts Premium Pvc Material, Which Ensures Better Use Safety And Longer Service Life. And It Features Ip67 High-level Water Resistance, Which Is Dustproof, Splashproof, And Easy To Clean. Due To Its High Flexibility, We Can Roll It Up For Storage. Meet Our Daily Needs: The Therm