The Farm Innovators Automatic Egg Turner is for use with Farm Innovators incubator models 2100 and 2200 (it's included with model 4200). It automatically turns the eggs completely every 4 hours to eliminate manual handling and improve hatch rate. To use, simply place the egg turner in the bottom of the incubator and plug in. No assembly required. Dishwasher safe. Egg rails snap out for easy cleaning. Comes with 41 large egg cups. Optional small quail egg trays are also available. An additional thermometer is also included.