Flare

Overview
This new equipment type is similar in appearance to the Radar Jammer and Power Drainer and makes its debut in Halo 3. It functions in a similar manner to a flashbang grenade, blinding foes and allies alike.

(In reference to the Flare Equipment by Griesmer): The Flare merely blinds rather than hurts, anyone friend or foe alike who sees it-and that's OK. "If you have a short range weapon, the flare will blind foes long enough for you to get close" says Griesemer. His favorite strategy? "See a bunch of people guarding the flag? Throw the flare down." He says "By the time the Flare's gone, their flag is too." Just take care to divert your own eyes-the Flare will blind the player who throws it, too. - ((Quote from EGM September 2007 Issue))

Disadvantages
The player cannot see the battlefield even if he/she deploys it.