Regenerator

The Regenerator is a piece of equipment.

Background
The Regenerator emits a green field of energy which restores a player's shield as well as an enemy's. There is, however, a small delay before beginning the recharge, which means the player is still vulnerable, and you are vulnerable to rocket fire and head shots from a sniper rifle. It also won't help if a lot of people are firing at you. It is the exact opposite of the Power Drainer and when it is used in the same area as a Power Drainer, the Power Drainer overpowers the Regenerator.

Trivia

 * If you stand near the Regenerator, you will hear a heart beating.
 * It shares a striking resemblence to the UNSC ONI Bubble Shield