This AC/DC Line Changer Board is used for incubator machines. It handles automatic switching and control of AC and DC lines inside the incubator. It is a vital component for properly operating heaters, fans, lights, and motors in egg-hatching machines. Features: Specially for Incubator Machine, AC to DC / DC to AC Line Control, 3 Channel Relay Board, High Quality Songle Relay, Includes LED Indicator, Strong & Durable PCB