Our unit has a built-in hygrometer, two extra large observation windows 9-1/2 x 3-1/2 in, extra temperature probe and state of the art thermostat and circuitry, indicator light, easy quick connects for the fan kit model 3100, ventilation plugs along with built-in moisture rings in the bottom of the incubator. This unit holds approximately 45 chicken eggs, 115 quail eggs, 90 pheasant eggs and 41 turkey or duck eggs. 40 W, 120 VAC.