Noise Level

Noise refers to the amount of audible noise that a weapon makes that enemies perceive in the game. Noise level is measured in meters, determined by how close an enemy needs to be in order to 'hear' the player firing a weapon and proceed to become alerted. Weapon noise is a key component of Stealth and must be considered when doing stealth missions.

Enemies who hear noise can do one of three things besides becoming alerted to the players presence. An enemy may choose to locate the nearest cover and hide, waiting to ambush players if they get into range, run to the source of the noise and then search the area, or run to activate a Control Console to sound the alarm in the area.

Noise level can be decreased by some mods if not already completely silent. These include Hush for rifles and Suppress for pistols.