These have power to shut heaven, that it rain not in the days of their prophecy: and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will. These have power to shut heaven - As Elijah did, 1 Kings 17:1-18.
To turn them to blood - As Moses did, Exodus 7:19-25. They shall have power to afflict the land with plagues, similar to those which were inflicted on the Egyptians.