A handy gift to start using in January! For all those times, you tried to start seeds on a windowsill, now you can do it right! Gentle bottom heat for great success! This mini-size (3-inch x 20-inch) windowsill heat mat is just right for smaller spaces like a sunny windowsill. The bottom heat (warms the root area 10-20°F over ambient temperature) improves germination and rooting, providing uniform heat for seedlings or cuttings. Plus it can help to overcome the winter chill that can seep through older windows. UL listed; 7.3 W; 120 Volt. Ship wt. 1 lb.