VIVOSUN 10"x 20.75" Germination Kits with Seedling Heat Mat and Digital Thermostat MET Standard RELIABLE RESULTS: VIVOSUN's professional heat mat maintains temperatures in the sweet spot of around 10-20 above ambient air temperature - perfect for seed starting and cutting propagation! PROFESSIONAL RELIABILITY: The controller maintains a stable temperature between 68-108F (20-42C) for professional horticultural systems; the sensor probe delivers accurate readings in both cool and warm environments. GOOD VENTILATION: The high dome propagator has one vent in the top of the dome can be opened or closed. Dimensions: Heat Mat -10"x 20.75"; Thermostat: 5.3" x 3" x 1.5"; Propagator: 22"x11.8"x4.7". Package includes: 1 - Heat Mat; 1 - Digital Thermostat; 1 - High Dome Propagator