Deathstreak

Deathstreaks are a feature introduced in Modern Warfare 2. They provide unique abilities after being killed, although their effectiveness is limited in order to discourage players from intentionally dying in streaks to activate them. They will activate upon each respawn the player has after the necessary number of deaths until a kill is scored. When the deathstreak is snapped, the deathstreak perk remains in effect for the remainder of that life; the following respawn will not have the deathstreak active.

The number of deaths required for a particular deathstreak can be reduced by one when using the Hardline Pro Perk, except Painkiller, which still needs 3 deaths to activate.