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 Drain and when it is used in the same area as a Power Drain, the Power Drain overpowers the Regenerator.

An interesting point is that though Brutes tend to use Regenerators in many situations, they do not have personal shielding and the Regenerator does not appear to affect their power armor at all.

Trivia

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