How to use EMP?

[FrOsT_]

This may sound stupid but im being serious here

im playing through the campaign and im at that part where some guy is telling you to go to the docks (dont tell me who it is) and i need to kill this robot but i dont know which button is to use the EMP grenade. I cant find it in the control options and i dont think i unbound it so tell me which button it is.

[Ghost]

EMP is a tactical grenade. You cycle through the different types by holding E and pressing R (or whatever key binding you have set up).

There are Flash, Threat and EMP grenades.