This is a used item, but I've used it about 10 times. It's still usable. It can set about 24 eggs at once. Even if the fertile egg rate is low, you can rest assured. In my experience, the hatching rate was high, and about half of the fertile eggs hatched. Plastic tray with a built-in fan that operates on AC power. - Power supply: AC power - Fan: Built-in fan - Tray: Plastic tray - Accessories: Divider rods Thank you for looking.