TN Games' FPS jacket and headset is a peripheral designed to get you closer to the action.
The vest was developed by a US surgeon, Dr Mark Ombrellaro, originally as a medical diagnostic tool for tele-health, to do heath checks remotely.
There are eight air pressure units in the jacket and four in the helmet. Each time you are shot, or damaged in the game, you feel it on the jacket.
It's most dramatic when you are hit in the head.
The jacket and headset works with a limited range of titles, including Half Life 2 and Doom 3, but there is an API for developers to adapt their games.