Looks like a normal gun/item, companies vary i believe, and they have a dark pink/pink colored name. When you have your inventory sorted to All, they are on the top, above even orange weapons. Some of them are lame (i dont like the dart guns too much) and some are awesome (theres some that shoot homing bullets that seek out and hit an enemy on their own, so you only have to aim in the general direction). And they arent really all that rare. I finished Vault Hunters mode and through both playthroughs i probably found around a dozen E-techs, and only found 2 oranges.