The meter is represented by two digit numbers and the word "Energy" (although in the original Metroid, "EN" is displayed, and Metroid: Zero Mission only displays the numbers). The meter records up to 99 units per Tank. The Prime games and Other M feature an energy bar along with the number digits, which gradually shrinks and refills as Samus loses and regains energy. If her energy is drained completely, Samus will die or the Power Suit will be unable to protect her, leading to the Game Over screen. In 3-D games, if energy drops to a low level, the HUD will beep and flash a warning to Samus. To stay alive, Samus must keep the shielding of her Power Suit charged by obtaining Energy Capsules, using Energy Charge or Recharge Stations or Save Stations or entering her Gunship.