This kit comes with 50 watt high quality crystalline solar panel and two solar fans for cross ventilation they can be installed on two sides of the attic for good airflow. These are 12 volt DC fan configured to work with solar panel. These fans can be Installed behind the gable vent or anywhere in attic. Both fan turns on as soon as the sunlight hits the solar panel and turns off at night. keeps the house cool and ventilated with fresh air circulation all day. Do not need to make holes in the roof to install solar fan it can be installed in gable vent. No need of electricians, No permits, No inspections.Wiring is quick and easy. Solar panel comes with manufacturer warranty of 25 years and generally produce power for 25 to 30 years. You get two fans both with dimension of 12" X 12" X 3". Full refund if the product is defective. Instructions to install the solar panel and fans are included. Fan comes with four mounting tabs, Solar Panel comes with 4 mounting brackets. Included 15 feet of wire plus connectors are pre-installed. Instructions are included. Built in U.S.A.