VIVOSUN Seedling Heat Mat Thermostat Kit includes a 10" x 20" black plastic heat mat and thermostat. The set is designed to provide warmth for seed starting. The mat is waterproof and measures 20" in length, width, and height. It operates at 120V and comes with a 1-year manufacturer warranty. Ideal for hydroponics and propagation, this heating pad is suitable for indoor gardening setups.