The weapon has the option of splitting apart or can be put together at any time. The Pack-a-Punched version seen in this video makes it appear that the zombies perform some kind of extra animation before expanding.
Only one zombie can be affected at a time by the Two-Handed version After hitting left on the D-pad the Two-Handed version combine to become a weapon, firing a purple beam that causes the zombies to begin to expand and explode. The first time equipped, the weapon is in a Two-Handed mode contrary to popular belief, one did not fire like the Beam Gun and the other like a Wunderwaffle DG-2, both fire like the Wunderwaffle DG-2 but with a different and similar effect but does not 'chain' the other zombies. The weapon can be obtained from the Mystery Box. When it is Pack-a-Puncheada, the two-handed version becomes Weapon Zap'Porter's X' 2 and the combined version becomes the Max's Wave Gun. It can also be disassembled and can be used two-handed where it becomes the Two-Handed Electric Weapon. It causes the Zombies to start coughing up Blood and then slowly inflate (or expand), then start floating for a moment and then explode into a red haze. El wave weapon ( O Wave Gun in English) is one of two Wonderful Weapons that appear in the zombie Moon level.