This is a slow-hatching egg with a small chicken inside.  Add water to the egg and the chicken will hatch from 4 to 8 hours.

Add 3 water beads to the push rod an pour water to the bottom of the egg and close the egg.

When the egg has fully hatched, you can take out the water beads and set in a container and let it dry and it can be reused.

Here is a sample time-lapse video of the hatching in progress.