Root
 Radiance seedling heat mat warms root area up to 20 degrees over 
ambient temperature, improving the germination process and overall 
success of seedlings and cuttings. Durable, portable and water 
resistant, root radiance is ideal for greenhouses, nurseries, and indoor
 gardens. This new series features a "Master Mat" with Add-On mats sold 
separately. These new heat mats are daisy chain capable, and each Master
 Mat can handle up to 3 Add-Ons. Also, each of these extra-large Heat 
Mats can accommodate up to (5) 10''x20''