Chaff Grenade

A miniature chaff dispenser. Chaff are small aluminum strips that are specifically designed to confuse radar frequencies, and normally used by aircraft to fool missile radar. The individual strips are cut in such a way that they wreak havoc with radar's transmitted frequencies. The Metal Gear Solid Chaff Grenade seems to be ficticious (at least, there seems to be no available documentation on handheld chaff grenades), but the technology is sound. It only works against radar, however. Visual and IR sensors are not affected by ordinary chaff, unlike the way it is portrayed in-game.