With the Brinsea OvaView High Intensity Bird Egg Candler， you can safely candle darker， mottled eggs without harming the embryos. This candler uses high output， high efficiency LED illumination which won’t cause heat damage. Because this candler has a higher power drain， it must be powered with four AA rechargeable batteries (not included). A flexible black ring creates a seal against average-sized egg shells for optimal viewing， and a second smaller ring is ideal for smaller eggs. You can use this candler as a hand-held device or you can place it on a work surface.