The combo card is obtained by Chuck after leveling up, but it can be created and utilized by Frank. Nevertheless, Chuck is the only one who can perform this weapon's heavy attack.
Primary: Push to make Chuck or Frank thrust both ends of the weapon directly into a zombie, killing it instantly with an electric shock and sending its corpse flying backwards. Takes roughly about 2 hits to kill a gas zombie.
Heavy: Hold to make Chuck or Frank clamp the Shocker onto the head of a zombie and keep it there until the zombie's skull explodes. The player can also see the effects of a small light show while performing this action.
Defensive Hold to bring the weapon up to a defensive position where Chuck of Frank will rub the ends together for a more shocking attack. Tap to throw a quick left-handed jab with the shocker.
In Dead Rising 2: Case West, Chuck Greene seems to like this weapon, but Frank West thinks of it as little more than a piece of crap wrapped in duct tape. This can be further supported if the player willingly gives Frank a Shocker to fight with; to which he'll respond by saying something like "This is garbage!"
In OTR, in the infirmary in the Safe House, there are two medical trays and one Defibrillator, which is one of the easiest ways to make a Shocker since there is a Maintenance Room outside the Safe House.