Two Hydrofarm MT10009 48x20" Seeding Heat Mats - IDEAL FOR 4 FLATS * 48x20" mat - Fits under 4 Common seeds flats * Warms root area 10-20°F over ambient temperature to improve germination and increases success of seedlings and cuttings * Light, watering and planting information on mat * 107 Watts and 120 Volts - The only UL Listed seedling heat mats on the market!