This kit includes a 110-220V W3001 thermostat, a thermohygometer, an rocker switch, a blower fan, and an egg candling flashlight that are all designed to help make your DIY eggs incubator work at its best. The thermostat and thermohygometer will help you to set the right temperature for your incubator and the off rocker switch will allow you to turn the machine on and off whenever you need to. The blower fan helps circulate the air inside the incubator to create an even temperature for the eggs. Finally, the egg candling flashlight will let you inspect the eggs while incubating. incubator