Specification: Product material: 4mm pine wood Product size: 22.1 x 17.7 x 14cm / 8.7 x 6.97 x 5.51in Product weight: 0.49kg / 17.28oz Power: 8W Plug type: 110V US plug, 220V EU plug, 220V UK plug, 220V AU plug (Optional) Description: Check the development of eggs timely during the incubation period: The 1st egg test (Day 5th-6th) is primarily conducted to assess egg fertilization, identify unfertilized eggs, scattered yellow eggs, and dead eggs. The second egg test (Day 11th-12th) focuses on examining the development of the egg embryo. A well-developed embryo will appear larger, with visible blood vessels and a large, distinct air chamber. The third egg test (Day 16th-17th) involves shining light from the pointed side. A well-developed embryo will be larger and completely fill the egg, with minimal light transmission. In contrast, a dead egg will exhibit blurred blood vessels, yellow areas near the air chamber, and an unclear boundary between the egg and the air chamber. Hatching period (Day 19th-21th):It's into hatching period once cracks appeared on the eggshell,Meanwhile increase the humidity to ensure the eggshell soft enough to break,and decrease the temperature into 37-37.5°C/98-99°F. Packing List: 1 x Egg Incubator