Minecraft wiki entry for Beacon, associated text: In the GUI, the player places the item to be fed in the empty slot and clicks an effect from the "Primary Power" section on the left. If the beacon is sitting on a 4-level pyramid, the "Secondary Power" section on the right also becomes active. The player can then choose either to turn on the Regeneration power in addition to the Primary Power or to raise the primary power to Level II. The user clicks the "Done" button (green checkmark), the item is consumed, and the power(s) become activated. To change the beacon's powers, this process must be followed again, consuming another ingot or gem.