A new class of usable items in Halo 3 are known as Equipment. These items have various effects and functions, ranging from defensive effects (Bubble Shield and Regenerator), or objects which blind or confuse the enemy (Flare, and Radar Jammer), to ones which can actually harm and kill (Power Drainer and Tripmine). Most of these are named by their function.
They are not designed to give one player a significant advantage, as they affect both sides equally, but as items which change the dynamic of a fight momentarily.
The Bubble Shield, for example, produces a protective dome but, a person inside cannot fire out, just as a person outside cannot fire in. This creates a stalemate situation until the Bubble Shield fails, or players move through the shield onto one side of it. Equally, once the Portable Gravity Lift is dropped it can be used by both sides to gain greater height into the air, often to get over specific obstacles.
