The Farm Innovators Still Air Incubator easily accomodates up to 4 dozen eggs. A built-in hygrometer measures both internal temperature and relative humidity. Solid state circuitry provides long lasting and reliable temperature setting. 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 recycled and insulating polystyrene foam. 120 volts; 40 watts; 0.33 amps.