The Farm Innovators Circulated Air Incubator easily accomodates up to 4 dozen eggs. The included fan kit pulls in fresh air to stabilize the temperature and improve hatching. A built-in hygrometer measures both internal temperature and relative humidity. Solid-state circuitry provides long-lasting and reliable temperature settings. A red indicator light shows when the heater is operating. Two large 9-1/2-inch by 3-1/2-inch viewing windows allow for observation of eggs. An additional thermometer is included. This is a great incubator for hobbyists and for educational purposes. Made with insulating polystyrene foam. It has power of 120 volts 40W and 0.33 amps.