The Voltage-Proof Coil is a key item that appears in Wario: Master of Disguise.
The Voltage-Proof Coil is a coil that is yellow in color and has a little diamond on the top of it.
The Voltage-Proof Coil is a rather special item that can be found in Carpaccio's Lab. With it, Wario will not take damage from the electrical currents in the level anymore allowing him to access new areas. The Voltage-Proof Coil can be found in a room with numbered switches that requires Arty Wario to draw blocks on top of them in order to reveal the chest with the coil inside.