Heartbeat Sensor



The Heartbeat Sensor is an attachment used in Call of Duty: Modern Warfare 2. The attachment allows the user to track multiple targets, somewhat like UAV and very similarly to the motion tracker in Halo 3. The display screen can be folded out from the side of the weapon. Its first known use is in the level Cliffhanger, where Roach finds himself in near white-out conditions. The sensor uses some kind of IFF system to tell the difference between friendlies and enemies. Friendlies are blue dots and enemies are white. In multiplayer, enemies appear as red dots instead of white.



The new version of UAV jammer, Cold-Blooded, cannot block the sensor; only the perk Ninja can. This attachment has been seen on the ACR, M82, AA12 and M240, meaning that it will most likely be compatible with almost all weapon categories.

Trivia

 * The Heartbeat Sensor can not be folded back towards the gun in multiplayer.