This basic model holds up to 30 eggs. Wire grill safely supports eggs during hatch period. Made of durable thermal plastic to help retain warmth and keep constant temperature. Circulated Air Fan Kit & Egg Turner Sold Separely. Features two 4" x 8" viewing windows - ideal for educational purposes - and solid state thermostat control, thermometer, and moisture rings. EGG TURNER SOLD SEPARATELY. L 17.75" x W 17.75" x H 8"